CN114069628A - Harmonic suppression method and system for three-phase energy storage converter - Google Patents
Harmonic suppression method and system for three-phase energy storage converter Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a harmonic suppression method and a harmonic suppression system for a three-phase energy storage converter, which are characterized by comprising the following steps: reconstructing the output current of the three-phase energy storage converter; extracting fundamental wave current and harmonic current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter; the control quantity of the three-phase energy storage converter is determined according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, and then the switching signal of the three-phase energy storage converter is determined.
Description
Technical Field
The invention relates to the field of power grids, in particular to a harmonic suppression method and a harmonic suppression system for a three-phase energy storage converter.
Background
The three-phase energy storage converter is core equipment for realizing the conversion of electric energy between an energy storage battery and a power grid, and plays important roles of active and reactive decoupling control, current quality optimization and the like.
However, under the influence of the problems of grid voltage harmonics, nonlinearity of power electronic devices and the like, harmonic currents mainly including 5 th harmonic and 7 th harmonic often exist in the alternating current output by the three-phase energy storage converter, and the quality of the electric energy output by the three-phase energy storage converter is seriously reduced.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method and a system for suppressing harmonic waves of a three-phase energy storage converter, which can improve the quality of output power of the three-phase energy storage converter.
In order to achieve the purpose, the invention adopts the following technical scheme: in a first aspect, a harmonic suppression method for a three-phase energy storage converter is provided, which includes:
reconstructing the output current of the three-phase energy storage converter;
extracting fundamental wave current and harmonic current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter;
and determining the control quantity of the three-phase energy storage converter according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter.
Further, the reconstructing the output current of the three-phase energy storage converter comprises:
collecting three-phase output current of a three-phase energy storage converter;
respectively constructing a three-phase output ammeter of the three-phase energy storage converter according to the collected three-phase output current;
re-determining the three-phase output current of the three-phase energy storage converter in a three-phase output ammeter of the three-phase energy storage converter through table lookup respectively;
and determining the three-phase reconstruction output current of the three-phase energy storage converter according to the re-determined three-phase output current of the three-phase energy storage converter.
Further, the three-phase reconstruction output current of the three-phase energy storage converter is determined by adopting an angle rotation algorithm.
Further, the three-phase reconstruction output current of the three-phase energy storage converter is as follows:
wherein k is a sampling time, and k is 1,2,3, …; i.e. ida(k)、idb(k)、idc(k) Respectively carrying out a-phase reconstruction output current, b-phase reconstruction output current and c-phase reconstruction output current of the three-phase energy storage converter at the kth sampling moment; f. ofsIs the sampling frequency; int (·) is a rounding operation;
are respectively the first
And the phase a output current, the phase b output current and the phase c output current of the three-phase energy storage converter are re-determined at each sampling moment through table lookup.
Further, the fundamental current and the harmonic current of the three-phase energy storage converter are as follows:
wherein,
fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter at the kth sampling moment are respectively obtained; t (-) is the transition matrix.
Further, the determining the control quantity of the three-phase energy storage converter according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter includes:
determining the control quantity of the three-phase energy storage converter by adopting a vector divider according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter;
and obtaining a switching signal of the three-phase energy storage converter by adopting a space proper pulse width modulation algorithm according to the control quantity of the three-phase energy storage converter.
Further, the control quantity of the three-phase energy storage converter is as follows:
wherein u isα、uβRespectively an alpha axis control quantity and a beta axis control quantity of the three-phase energy storage converter; theta is the phase of the power grid voltage; PI (-) is a PI controller.
In a second aspect, a harmonic suppression system for a three-phase energy storage converter is provided, including:
the output current reconstruction module is used for reconstructing the output current of the three-phase energy storage converter;
the current extraction module is used for extracting fundamental wave current and harmonic current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter;
and the control quantity determining module is used for determining the control quantity of the three-phase energy storage converter according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter.
In a third aspect, a processing device is provided, which includes computer program instructions, wherein the computer program instructions, when executed by the processing device, are configured to implement the corresponding steps of the three-phase energy storage converter harmonic suppression method.
In a fourth aspect, a computer readable storage medium is provided, and computer program instructions are stored on the computer readable storage medium, wherein the computer program instructions are used for implementing corresponding steps of the harmonic suppression method for the three-phase energy storage converter when being executed by a processor.
Due to the adoption of the technical scheme, the invention has the following advantages:
1. according to the invention, the 5 th harmonic current and the 7 th harmonic current of the three-phase energy storage converter are reconstructed and extracted through an angle rotation algorithm and a vector divider, a low-pass filter is not needed, the control stability is better, and the stable operation of the three-phase energy storage converter can be ensured while the harmonic wave is suppressed.
2. The invention realizes the fundamental current tracking and the suppression of the 5 th harmonic and the 7 th harmonic of the three-phase energy storage converter through the fundamental tracking-harmonic compensation controller, has the advantages of simplicity and high efficiency, can realize the static-state-free tracking of the fundamental current, can eliminate the 5 th harmonic and the 7 th harmonic current, improves the waveform quality of the output current of the three-phase energy storage converter, and can be widely applied to the field of power grids.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Like reference numerals refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic flow chart of a method according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless specifically identified as an order of performance. It should also be understood that additional or alternative steps may be used.
The harmonic suppression method and the harmonic suppression system for the three-phase energy storage converter, provided by the embodiment of the invention, aim at the problem of suppression of 5 th harmonic current and 7 th harmonic current in alternating current output by the three-phase energy storage converter, are based on a vector splitter, and perform a suppression method on the harmonic of the three-phase energy storage converter, wherein the following formula is an expression of alternating current i output by the three-phase energy storage converter:
wherein, the delta V is the difference value between the output voltage of the three-phase energy storage converter and the voltage of a power grid; x is the output impedance of the three-phase energy storage converter; omega is the electric angle of the voltage of the power grid; t is time.
According to the expression of the alternating current output by the three-phase energy storage converter, except for the fundamental current, the three-phase energy storage converter mainly outputs 5-order and 7-order harmonic waves in the alternating current. Therefore, a compensation algorithm of 5 th harmonic and 7 th harmonic needs to be designed to improve the quality of the output electric energy of the three-phase energy storage converter.
Example 1
Based on the above description, as shown in fig. 1, the present embodiment provides a method for suppressing harmonic waves of a three-phase energy storage converter, including the following steps:
1) aiming at common 5 th harmonic and 7 th harmonic in the output current of the three-phase energy storage converter, an angle rotation algorithm is adopted to reconstruct the output current of the three-phase energy storage converter, and the method specifically comprises the following steps:
1.1) collecting a-phase output current i of a three-phase energy storage convertera(k) B phase output current ib(k) C phase output current ic(k)，k＝1,2,3,…。
1.2) outputting current i according to the collected a-phasea(k) B phase output current ib(k) C phase output current ic(k) Respectively constructing a-phase output ammeter S (i) of the three-phase energy storage convertera) B-phase output ammeter S (i)b) And c phase output ammeter S (i)c) Wherein:
S(ia)＝[ia(1),ia(2),…,ia(k)] (2)
S(ib)＝[ib(1),ib(2),…,ib(k)] (3)
S(ic)＝[ic(1),ic(2),…,ic(k)] (4)
1.3) output current meter S (i) of a phase of three-phase energy storage convertera) B-phase output ammeter S (i)b) And c phase output ammeter S (i)c) In which the a-phase output current i of the three-phase energy storage converter is redetermined by looking up the tablea(k) B phase output current ib(k) And c phase output current ic(k)。
1.4) adopting an angle rotation algorithm, and re-determining the a-phase output current i of the three-phase energy storage converter in the step 1.3)a(k) B phase output current ib(k) And c phase output current ic(k) Determining a phase reconstruction output current i of the three-phase energy storage converterda(k) B phase reconstruction output current iab(k) And c phase reconstructed output current idc(k)：
Wherein k is a sampling time, and k is 1,2,3, …; i.e. ida(k)、idb(k)、idc(k) Respectively carrying out a-phase reconstruction output current, b-phase reconstruction output current and c-phase reconstruction output current of the three-phase energy storage converter at the kth sampling moment; f. ofsIs the sampling frequency; int (·) is a rounding operation;
are respectively the first
And the phase a output current, the phase b output current and the phase c output current of the three-phase energy storage converter are re-determined at each sampling moment through table lookup.
2) And extracting fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter by adopting a vector divider according to the reconstructed output current of the three-phase energy storage converter.
Specifically, the fundamental current, the 5 th harmonic current and the 7 th harmonic current of the three-phase energy storage converter are as follows:
wherein,
fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter at the kth sampling moment are respectively obtained; t (-) is the transition matrix.
More specifically, the transition matrix is:
where x is the input of the transfer matrix, sin is the sine operation, and cos is the cosine budget.
3) And determining the control quantity of the three-phase energy storage converter by adopting a fundamental wave tracking-harmonic compensation controller according to the extracted fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter, and realizing fundamental wave current tracking and suppression of the 5-order harmonic and the 7-order harmonic of the three-phase energy storage converter.
Specifically, the control quantity of the three-phase energy storage converter is as follows:
wherein u isα、uβRespectively an alpha axis control quantity and a beta axis control quantity of the three-phase energy storage converter; theta is the phase of the power grid voltage; PI (-) is a PI controller, and:
PI(e)＝kpe+ki∫edt (9)
wherein e is the input of a PI controller; k is a radical ofpIs a proportionality coefficient; k is a radical ofiIs an integral coefficient.
More specifically, PI proportional coefficient k of controllerp20, integral coefficient ki2.5; the grid voltage phase θ is provided by a phase locked loop.
4) And obtaining a switching signal of the three-phase energy storage converter by adopting a space proper pulse width modulation algorithm according to the control quantity of the three-phase energy storage converter, wherein the space proper pulse width modulation algorithm is an algorithm disclosed in the prior art, and the specific process is not repeated herein.
Example 2
The embodiment provides a harmonic suppression system of a three-phase energy storage converter, which comprises:
and the output current reconstruction module is used for reconstructing the output current of the three-phase energy storage converter.
And the current extraction module is used for extracting fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter by adopting a vector divider according to the reconstructed output current of the three-phase energy storage converter.
And the control quantity determining module is used for determining the control quantity of the three-phase energy storage converter by adopting a fundamental wave tracking-harmonic compensation controller according to the extracted fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter.
Example 3
The present embodiment provides a processing device corresponding to the method for suppressing harmonic waves of the three-phase energy storage converter provided in embodiment 1, where the processing device may be a processing device for a client, such as a mobile phone, a notebook computer, a tablet computer, a desktop computer, and the like, to execute the method of embodiment 1.
The processing equipment comprises a processor, a memory, a communication interface and a bus, wherein the processor, the memory and the communication interface are connected through the bus so as to complete mutual communication. The memory stores a computer program which can be run on the processing device, and the processing device executes the harmonic suppression method of the three-phase energy storage converter provided by the embodiment 1 when running the computer program.
In some implementations, the Memory may be a high-speed Random Access Memory (RAM), and may also include a non-volatile Memory, such as at least one disk Memory.
In other implementations, the processor may be various general-purpose processors such as a Central Processing Unit (CPU), a Digital Signal Processor (DSP), and the like, and is not limited herein.
Example 4
The present embodiment provides a computer program product corresponding to the harmonic suppression method of the three-phase energy storage converter provided in this embodiment 1, and the computer program product may include a computer readable storage medium on which computer readable program instructions for executing the harmonic suppression method of the three-phase energy storage converter described in this embodiment 1 are loaded.
The computer readable storage medium may be a tangible device that retains and stores instructions for use by an instruction execution device. The computer readable storage medium may be, for example, but not limited to, an electronic memory device, a magnetic memory device, an optical memory device, an electromagnetic memory device, a semiconductor memory device, or any combination of the foregoing.
The above embodiments are only used for illustrating the present invention, and the structure, connection mode, manufacturing process, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solution of the present invention should not be excluded from the protection scope of the present invention.
Claims (10)
1. A harmonic suppression method for a three-phase energy storage converter is characterized by comprising the following steps:
reconstructing the output current of the three-phase energy storage converter;
extracting fundamental wave current and harmonic current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter;
and determining the control quantity of the three-phase energy storage converter according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter.
2. The method of harmonic suppression for a three-phase energy storage converter of claim 1 wherein said reconstructing the output current of the three-phase energy storage converter comprises:
collecting three-phase output current of a three-phase energy storage converter;
respectively constructing a three-phase output ammeter of the three-phase energy storage converter according to the collected three-phase output current;
re-determining the three-phase output current of the three-phase energy storage converter in a three-phase output ammeter of the three-phase energy storage converter through table lookup respectively;
and determining the three-phase reconstruction output current of the three-phase energy storage converter according to the re-determined three-phase output current of the three-phase energy storage converter.
3. The method of claim 2, wherein the determining the three-phase reconstructed output currents of the three-phase energy storage converter employs an angle rotation algorithm.
4. The method of claim 3, wherein the three-phase reconstructed output current of the three-phase energy storage converter is:
wherein k is a sampling time, and k is 1,2, 3.; i.e. ida(k)、idb(k)、idc(k) Respectively carrying out a-phase reconstruction output current, b-phase reconstruction output current and c-phase reconstruction output current of the three-phase energy storage converter at the kth sampling moment; f. ofsIs the sampling frequency; int (·) is a rounding operation;
are respectively the first
A-phase output current, b-phase output current and c-phase output current of three-phase energy storage converter re-determined by table lookup at each sampling momentAnd outputting the current.
5. The method of claim 4, wherein the fundamental current and the harmonic current of the three-phase energy storage converter are:
wherein,
fundamental wave current, 5-order harmonic current and 7-order harmonic current of the three-phase energy storage converter at the kth sampling moment are respectively obtained; t (-) is the transition matrix.
6. The method for suppressing harmonics in a three-phase energy storage converter as claimed in claim 5, wherein said determining the control variables of the three-phase energy storage converter and hence the switching signals of the three-phase energy storage converter according to the extracted fundamental current and harmonic current of the three-phase energy storage converter comprises:
determining the control quantity of the three-phase energy storage converter by adopting a vector divider according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter;
and obtaining a switching signal of the three-phase energy storage converter by adopting a space proper pulse width modulation algorithm according to the control quantity of the three-phase energy storage converter.
7. The method of claim 6, wherein the three-phase energy storage converter comprises the following control variables:
wherein u isα、uβRespectively an alpha axis control quantity and a beta axis control quantity of the three-phase energy storage converter; theta isA grid voltage phase; PI (-) is a PI controller.
8. A harmonic suppression system for a three-phase energy storage converter, comprising:
the output current reconstruction module is used for reconstructing the output current of the three-phase energy storage converter;
the current extraction module is used for extracting fundamental wave current and harmonic current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter;
and the control quantity determining module is used for determining the control quantity of the three-phase energy storage converter according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter.
9. A processing device comprising computer program instructions, wherein the computer program instructions, when executed by the processing device, are adapted to implement the corresponding steps of the three-phase energy storage converter harmonic suppression method according to any of the claims 1-7.
10. A computer readable storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by a processor, are adapted to carry out the corresponding steps of the method for harmonic suppression of a three-phase energy storage converter according to any of the claims 1-7.
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| CN102684198A (en) * | 2012-05-29 | 2012-09-19 | 电子科技大学 | Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system |
| CN109659939A (en) * | 2017-10-10 | 2019-04-19 | 株洲中车时代电气股份有限公司 | A kind of PWM control method of photovoltaic system 3-phase power converter |
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| CN102684198A (en) * | 2012-05-29 | 2012-09-19 | 电子科技大学 | Harmonic suppression method of bidirectional converter of energy accumulation unit in wind and light accumulation system |
| CN109659939A (en) * | 2017-10-10 | 2019-04-19 | 株洲中车时代电气股份有限公司 | A kind of PWM control method of photovoltaic system 3-phase power converter |
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