CN112054661B - Harmonic suppression static quantity output control method for single-phase electric system - Google Patents
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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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
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a harmonic suppression static quantity output control method for a single-phase electric system, which adopts a DQH control mode to control fundamental wave components by adopting a static coordinate system, firstly carries out fundamental wave and harmonic wave separation on voltage and current signals, extracts the fundamental wave by adopting a traditional instantaneous value power method, and requires additional low-pass filtering under the condition of harmonic wave input, so that response is too slow, harmonic wave extraction is carried out by using a resonator, then the fundamental wave is obtained, only the fundamental wave components are subjected to D, Q transformation, the influence of the harmonic wave input on the static quantity in actual control is avoided, the harmonic wave components are independently controlled for system stability and harmonic suppression, and currents are respectively controlled on a D, Q shaft under the static coordinate system, so that accurate no-static-difference output can be realized, and compared with the conventional direct control, the dynamic response capability is faster because no additional static-difference elimination loop is adopted. The method aims to solve the technical problem that in the prior art, the control performance is poor due to signal amplitude attenuation and distortion generated by transformation of a single-phase system.
Description
Technical Field
The invention relates to the technical field of automatic control of power electronics, in particular to a harmonic suppression static quantity output control method for a single-phase electric system.
Background
Due to the development of modern industry and technology, inverter power supplies are increasingly used in household electricity, vehicle-mounted electricity, mobile power supplies and the like, and the electricity power supplies of many users do not use alternating current provided by a large power grid as a power supply, but are converted through various power conversion, so that more stable and reliable electric energy forms are obtained. In general, dc power is converted into ac power to be supplied to a load, and various inverters such as a modified wave inverter, a sine wave inverter and a square wave inverter are provided, so that the power inverter has a wide variety of applications, and has good performance and price. Therefore, high-performance inverters are becoming hot spots in the current power electronics field. The sine pulse width modulation inverter is used as one of the inverters, can output sine waveforms with small harmonic content, improves the steady-state precision and reliability of the output waveforms, reduces the damage to electric equipment and the like, and is most widely applied to practical application.
The application of the inverter is very wide nowadays, various control technologies are increasingly beneficial, such as the application of the inverter is quite large in battery energy storage, photovoltaic power generation, frequency conversion electric appliances, remote weak current power supply in a power-free area and the like, and the inverter control technology with more excellent research performance is very necessary.
In a three-phase ac control system, in order to realize control like dc, a three-phase rotating coordinate system is converted into a stationary coordinate system, thereby realizing separate control of active and reactive on the DQ axis. In a single-phase system, DQ conversion cannot be directly performed due to only one phase, and the DQ conversion is generally realized by adopting virtual other two phases, phase delay, phase conversion and other technical methods, wherein the control performance is poor due to attenuation and distortion of signal amplitude generated by conversion. Therefore, how to provide a high-precision control method for the no-static-difference control of a single-phase system is a technical problem to be solved.
The foregoing is provided merely for the purpose of facilitating understanding of the technical solutions of the present invention and is not intended to represent an admission that the foregoing is prior art.
Disclosure of Invention
The invention mainly aims to provide a harmonic suppression static quantity output control method for a single-phase electric system, and aims to solve the technical problem that in the prior art, the control performance is poor due to signal amplitude attenuation and distortion generated by transformation of the single-phase system.
In order to achieve the above object, the present invention provides a harmonic suppression static quantity output control method for a single-phase electric system, the harmonic suppression static quantity output control method comprising the steps of:
acquiring harmonic signals and fundamental wave signals of single-phase electricity in a power grid;
performing DQ conversion on the acquired fundamental wave signals, performing PI adjustment on the fundamental wave signals on a D axis and a Q axis, performing pure ratio adjustment on harmonic wave signals, performing no-dead-difference control on the fundamental wave signals, and performing harmonic component control on the harmonic wave signals;
and performing DQ inverse transformation on the PI-regulated fundamental wave signals, and superposing and outputting the fundamental wave signals subjected to DQ inverse transformation and the regulated harmonic wave signals.
Preferably, the method for controlling harmonic suppression static output of a single-phase electric system, wherein the step of obtaining the harmonic signal and the fundamental wave signal of the single-phase electric in the electric network comprises the following sub-steps:
s101: collecting voltage and current signals in a power grid;
s102: the collected voltage and current signals are processed through a unidirectional phase-locked loop, so that the phase locking of the power grid is realized, and the angular frequency of the power grid is obtained;
s103: and extracting harmonic signals and fundamental wave signals according to the obtained grid angular frequency.
Preferably, a harmonic suppression static quantity output control method for a single-phase electric system, in the step S103:
the extracted harmonic signal is obtained by:
wherein: bandwidth of B, w pll Outputting angular frequency for the phase-locked loop, namely actual grid angular frequency;
the extracted fundamental wave signal is obtained by:
Base(n)＝Input(n)-Harmonic(n)；
wherein: input (n) is the original Input signal, harmonic (n) is the Harmonic signal, and Base (n) is the fundamental signal.
Preferably, a harmonic suppression static output control method for a single-phase electric system, the harmonic suppression static output control method further includes step S201: performing phase shift conversion on the acquired fundamental wave signal, wherein the phase shift conversion is as follows:
wherein w is pll The angular frequency, i.e. the actual grid angular frequency, is output for the phase locked loop.
Preferably, a harmonic suppression static output control method for a single-phase electric system performs DQ conversion on an acquired fundamental wave signal into:
D＝A*sin(wt)+Beta*cos(wt)
Q＝A*cos(wt)+Beta*sin(wt)；
wherein A is an input fundamental wave signal, beta is a phase-shift signal, cos (wt) is a phase-locked loop output cosine, sin (wt) is a phase-locked loop output synchronous sine, D is a D-axis component under a static coordinate system, and Q is a Q-axis component under the static coordinate system.
Preferably, a harmonic suppression static output control method for a single-phase electric system, wherein PI adjustment is performed on a D axis and a Q axis:
wherein K is p For comparison adjustment, K i Is an integral adjustment.
Preferably, a harmonic suppression static output control method for a single-phase electric system, wherein the PI-regulated fundamental wave signal is subjected to DQ inverse transformation into:
A'＝D*cos(wt)-Q*sin(wt)；
wherein D is a D-axis component under a static coordinate system, Q is a Q-axis component under the static coordinate system, cos (wt) is the output cosine of the phase-locked loop, sin (wt) is the output synchronous sine of the phase-locked loop, and A' is the output signal.
In the invention, a DQH control mode is adopted to control fundamental wave components by adopting a static coordinate system, fundamental wave and harmonic wave separation is firstly carried out on voltage and current signals, the fundamental wave is extracted by adopting a traditional instantaneous value power method, and extra low-pass filtering is required under the condition of harmonic wave input, so that response is too slow, harmonic wave extraction is carried out by utilizing a resonator, then the fundamental wave is obtained, D, Q conversion is carried out only on the fundamental wave components, the influence of harmonic wave input on static quantity in actual control is avoided, independent control is carried out on the harmonic wave components for system stability and harmonic wave suppression, and current is respectively controlled on a D, Q shaft under the static coordinate system, so that accurate static error-free output can be realized, and compared with conventional direct control, the dynamic response capability is faster because an extra static error elimination loop is not needed. The method aims to solve the technical problem that in the prior art, the control performance is poor due to signal amplitude attenuation and distortion generated by transformation of a single-phase system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing a transfer function characteristic curve of a phase change in the present embodiment;
FIG. 2 is a schematic diagram of the steps of a prior art voltage and current direct control single-phase control method;
fig. 3 is a schematic diagram of steps of a harmonic suppression static output control method for a single-phase electric system according to the present embodiment.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The present invention proposes an embodiment.
As shown in fig. 1, in this embodiment, a harmonic suppression static output control method for a single-phase electric system specifically includes the following steps: 1. voltage and current acquisition data
2. A single-phase-locked loop for realizing the phase locking of the power grid and obtaining the angular frequency of the power grid
3. Fundamental and harmonic separation
B: bandwidth of a communication device
w pll Phase-locked loop output angular frequency, i.e. the actual grid angular frequency formula (1)
Extracting harmonic wave by using the formula (1), and extracting fundamental wave signal according to the formula (2)
Base(n)＝Input(n)-Harmonic(n)
Input (n): original input signal
Harmonic signal (n)
Base (n): fundamental wave signal formula (2)
4. DQ axis conversion by fundamental wave
The phase transformation adopts the formula (3) to transform, the method needs to obtain the angular frequency of the power grid, the transfer function characteristic curve is as shown in figure 1, the transfer function has the characteristic of not becoming amplitude, but has the nonlinear phase characteristic, so that fundamental wave harmonic wave separation is firstly carried out, only fundamental wave components are subjected to phase shift transformation, only the fundamental wave components are subjected to phase shift transformation, and the influence of non-fundamental frequency input signals on transformation is avoided.
w pll Phase-locked loop output angular frequency, i.e. the actual grid angular frequency formula (3)
5. Fundamental wave DQ conversion
D＝A*sin(wt)+Beta*cos(wt)
Q＝A*cos(wt)+Beta*sin(wt)
A: inputting basic signals
Beta: phase-shifted signal
cos (wt): phase-locked loop output cosine
sin (wt): phase locked loop output synchronous sinusoid
D: d-axis component in stationary coordinate system
Q: d-axis component formula (4) under static coordinate system
Equation (4) is the standard DQ conversion.
5. DQH current loop control, DQ realizing indifferent control and H component realizing harmonic part inhibition
K p : specific column adjustment
K i : integral regulating formula (5)
And the D axis and the Q axis carry out PI adjustment according to a formula (5), so that no static difference control can be realized.
The harmonic component is regulated by adopting a pure ratio column, so that the harmonic component is controlled.
6. Fundamental wave DQ inverse transformation
A'＝D*cos(wt)-Q*sin(wt)
D: d-axis component in stationary coordinate system
Q: d-axis component in stationary coordinate system
cos (wt): phase-locked loop output cosine
sin (wt): phase locked loop output synchronous sinusoid
A': output signal formula (7)
Because the control system is single-phase control, the A reverse conversion is only carried out according to the formula (7)
7. Superposing harmonic control quantity and outputting
After DQ dead-difference adjustment and harmonic adjustment, the two components are output in a superposition way.
In this embodiment, compared to voltage and current direct control:
the current control is shown in fig. 2, the method has the advantages that the control is simple, the current is given to be directly regulated by the reference and the sampling feedback, but because the current is alternating, the static difference cannot be eliminated at the point, and the static difference can be eliminated only by adding an additional control loop, namely the IacCom static difference compensation current in fig. 1 is needed, and the dynamic characteristic of the system is greatly weakened by adding a static difference elimination loop.
In this embodiment, compared to the virtual two other phases:
according to the method, an input signal is used as an A phase, a trigonometric function is utilized to carry out phase transformation on the input signal to obtain virtual B and C phases, DQ transformation is carried out by A, B, C, and control under a static coordinate system is realized.
In this embodiment, as shown in fig. 3, a control manner of DQH is adopted, a static coordinate system is adopted for controlling the fundamental component, first, fundamental wave and harmonic wave are separated from the voltage and current signals, the fundamental wave is extracted by the traditional instantaneous value power method, and extra low-pass filtering is required under the condition of harmonic wave input, so that response is too slow, the harmonic wave is extracted by using a resonator, then the fundamental wave is obtained, D, Q transformation is only carried out on the fundamental component, the influence of harmonic wave input on static quantity in actual control is avoided, independent control is carried out on the harmonic component for system stability and harmonic suppression, and current is respectively controlled on a D, Q axis under the static coordinate system, so that accurate static error-free output can be realized, and compared with conventional direct control, dynamic response capability is faster because of no extra static error elimination loop.
The method, system and module disclosed in the invention can be realized in other modes. For example, the embodiments described above are merely illustrative, and for example, the division of the modules may be merely a logical functional division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with respect to each other may be said to be through some interface, indirect coupling or communication connection of systems or modules, which may be in electrical, mechanical, or other form.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, an optical disk, or other various media capable of storing program codes.
The foregoing is merely a preferred embodiment of the invention, and it is to be understood that the invention is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the invention are intended to be within the scope of the appended claims.
Claims (7)
1. A harmonic suppression static output control method for a single-phase electrical system, characterized by comprising the steps of:
acquiring harmonic signals and fundamental wave signals of single-phase electricity in a power grid;
DQ conversion is carried out on the acquired fundamental wave signals, PI regulation is carried out on the fundamental wave signals on the D axis and the Q axis, pure proportion regulation is carried out on the harmonic wave signals, no dead difference control is carried out on the fundamental wave signals, and harmonic component control is carried out on the harmonic wave signals;
and performing DQ inverse transformation on the PI-regulated fundamental wave signals, and superposing and outputting the fundamental wave signals subjected to DQ inverse transformation and the regulated harmonic wave signals.
2. The harmonic suppression static output control method for a single-phase electrical system as recited in claim 1, wherein said obtaining harmonic and fundamental signals of single-phase electricity in the electrical grid comprises the sub-steps of:
s101: collecting voltage and current signals in a power grid;
s102: the collected voltage and current signals are processed through a unidirectional phase-locked loop, so that the phase locking of the power grid is realized, and the angular frequency of the power grid is obtained;
s103: and extracting harmonic signals and fundamental wave signals according to the obtained grid angular frequency.
3. The harmonic suppression static output control method for a single-phase electrical system according to claim 2, wherein in step S103:
the extracted harmonic signal is obtained by:
wherein: bandwidth of B, w pll Outputting angular frequency for the phase-locked loop, namely actual grid angular frequency;
the extracted fundamental wave signal is obtained by:
Base(n)＝Input(n)-Harmonic(n)；
wherein: input (n) is the original Input signal, harmonic (n) is the Harmonic signal, and Base (n) is the fundamental signal.
4. The harmonic suppression static quantity output control method for a single-phase electric system according to claim 1, characterized in that the harmonic suppression static quantity output control method further comprises step S201: performing phase shift conversion on the acquired fundamental wave signal, wherein the phase shift conversion is as follows:
wherein w is pll The angular frequency, i.e. the actual grid angular frequency, is output for the phase locked loop.
5. The harmonic rejection static output control method for a single phase electrical system as in claim 1 wherein DQ conversion of the acquired fundamental wave signal is as follows:
D＝A*sin(wt)+Beta*cos(wt)
Q＝A*cos(wt)+Beta*sin(wt)；
wherein A is an input fundamental wave signal, beta is a phase-shift signal, cos (wt) is a phase-locked loop output cosine, sin (wt) is a phase-locked loop output synchronous sine, D is a D-axis component under a static coordinate system, and Q is a Q-axis component under the static coordinate system.
6. The harmonic rejection static output control method for a single phase electrical system as in claim 5 wherein PI adjustment on the D and Q axes is:
wherein K is p For proportional adjustment, K i Is an integral adjustment.
7. The harmonic rejection static output control method for a single phase electrical system as in claim 6 wherein the PI regulated fundamental signal is DQ back transformed into:
A'＝D*cos(wt)-Q*sin(wt)；
wherein D is a D-axis component under a static coordinate system, Q is a Q-axis component under the static coordinate system, cos (wt) is the output cosine of the phase-locked loop, sin (wt) is the output synchronous sine of the phase-locked loop, and A' is the output signal.
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