CN114069628B - 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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- 238000004590 computer program Methods 0.000 claims description 12
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- 238000012545 processing Methods 0.000 claims description 11
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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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- 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
- 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 relates to a harmonic suppression method and a harmonic suppression system for a three-phase energy storage converter, which are characterized in that the method comprises 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; according to the extracted fundamental wave current and harmonic current of the three-phase energy storage converter, the control quantity of the three-phase energy storage converter is determined, 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 system for a three-phase energy storage converter.
Background
The three-phase energy storage converter is core equipment for realizing conversion of electric energy between an energy storage battery and a power grid, and plays an important role in active and reactive decoupling control, current quality optimization and the like.
However, due to the influence of the problems of grid voltage harmonic waves, nonlinearity of power electronic devices and the like, harmonic currents mainly including 5 th harmonic waves and 7 th harmonic waves often exist in the output alternating current of the three-phase energy storage converter, and the output power quality of the three-phase energy storage converter is seriously reduced.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a harmonic suppression method and a harmonic suppression system for a three-phase energy storage converter, which can improve the output power quality of the three-phase energy storage converter.
In order to achieve the above purpose, the present invention adopts the following technical scheme: in a first aspect, a method for suppressing harmonics of a three-phase energy storage converter is provided, including:
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 includes:
collecting three-phase output current of a three-phase energy storage converter;
respectively constructing three-phase output ampere meters of the three-phase energy storage current transformer according to the collected three-phase output currents;
the three-phase output current of the three-phase energy storage converter is respectively determined again through table lookup in a three-phase output ammeter of the three-phase energy storage converter;
and determining three-phase reconstruction output current of the three-phase energy storage converter according to the 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:
where k is the sampling instant and k=1, 2,3, …; i.e da (k)、i db (k)、i dc (k) The method comprises the steps of respectively reconstructing an a-phase reconstruction output current, a b-phase reconstruction output current and a c-phase reconstruction output current of the three-phase energy storage converter at a kth sampling moment; f (f) s Is the sampling frequency; int (·) is a rounding operation;respectively +.>The a-phase output current, the b-phase output current and the c-phase output current of the three-phase energy storage converter are redetermined according to the table lookup at each sampling moment.
Further, the fundamental wave current and harmonic current of the three-phase energy storage converter are as follows:
wherein,the fundamental wave current, the 5 th harmonic wave current and the 7 th harmonic wave current of the three-phase energy storage converter at the kth sampling moment are respectively; t (·) is the transfer 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 comprises the following steps:
a vector divider is adopted, and 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 obtaining a switching signal of the three-phase energy storage converter according to the control quantity of the three-phase energy storage converter by adopting a proper amount of space pulse width modulation algorithm.
Further, the control quantity of the three-phase energy storage converter is as follows:
wherein u is α 、u β The control quantity of the alpha axis and the control quantity of the beta axis of the three-phase energy storage converter are respectively; θ is the grid voltage phase; PI (-) is the PI controller.
In a second aspect, a harmonic suppression system for a three-phase energy storage converter is provided, 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;
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 signals of the three-phase energy storage converter.
In a third aspect, a processing device is provided, including computer program instructions, where the computer program instructions, when executed by the processing device, are configured to implement steps corresponding to the above-mentioned method for harmonic suppression of a three-phase energy storage converter.
In a fourth aspect, a computer readable storage medium is provided, where computer program instructions are stored on the computer readable storage medium, where the computer program instructions are executed by a processor to implement steps corresponding to the above-mentioned three-phase energy storage converter harmonic suppression method.
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 rebuilt and extracted through the angle rotation algorithm and the 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 restrained.
2. The invention realizes the fundamental wave current tracking and the 5 th harmonic and 7 th harmonic suppression of the three-phase energy storage converter through the fundamental wave tracking-harmonic compensation controller, has the advantages of simplicity and high efficiency, can realize the static-free and differential-free tracking of the fundamental wave current, can eliminate the 5 th and 7 th harmonic currents, 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 parts are designated with like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method according to an embodiment of the 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 present invention are shown in the drawings, it should be understood that the present invention may 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" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "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 an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.
The method and the system for suppressing the harmonic waves of the three-phase energy storage converter aim at the problem of suppressing the 5 th harmonic current and the 7 th harmonic current in the output alternating current of the three-phase energy storage converter, and the method for suppressing the harmonic waves of the three-phase energy storage converter is based on a vector divider, wherein the following formula is an expression of the output alternating current i of the three-phase energy storage converter:
wherein DeltaV is the difference value between the output voltage of the three-phase energy storage converter and the voltage of the power grid; x is the output impedance of the three-phase energy storage converter; omega is the electric angle of the grid voltage; t is time.
The expression of the three-phase energy storage converter output alternating current shows that the 5 th harmonic and the 7 th harmonic are dominant in the three-phase energy storage converter output alternating current except the fundamental wave current. Therefore, a compensation algorithm of 5 th and 7 th harmonics needs to be designed to improve the output power quality 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 A phase output current i of the three-phase energy storage converter is collected a (k) B-phase output current i b (k) Phase c output current i c (k)，k＝1,2,3,…。
1.2 Based on the acquired a-phase output current i a (k) B-phase output current i b (k) Phase c output current i c (k) Respectively constructing a phase a output ammeter S (i a ) B-phase output ammeter S (i) b ) And c-phase output ammeter S (i) c ) Wherein:
S(i a )＝[i a (1),i a (2),…,i a (k)] (2)
S(i b )＝[i b (1),i b (2),…,i b (k)] (3)
S(i c )＝[i c (1),i c (2),…,i c (k)] (4)
1.3 A phase output ammeter S (i) of three-phase energy storage converter a ) B-phase output ammeter S (i) b ) And c-phase output ammeter S (i) c ) Respectively, redetermining a-phase output current i of the three-phase energy storage converter by looking up a table a (k) B-phase output current i b (k) And c-phase output current i c (k)。
1.4 Using an angle rotation algorithm to redetermine a-phase output current i of the three-phase energy storage converter according to the step 1.3) a (k) B-phase output current i b (k) And c-phase output current i c (k) Determining a-phase reconstruction output current i of three-phase energy storage converter da (k) B-phase reconstruction output current i ab (k) And c-phase reconstructed output current i dc (k)：
Where k is the sampling instant and k=1, 2,3, …; i.e da (k)、i db (k)、i dc (k) The method comprises the steps of respectively reconstructing an a-phase reconstruction output current, a b-phase reconstruction output current and a c-phase reconstruction output current of the three-phase energy storage converter at a kth sampling moment; f (f) s Is the sampling frequency; int (·) is a rounding operation;respectively +.>The a-phase output current, the b-phase output current and the c-phase output current of the three-phase energy storage converter are redetermined according to the table lookup at each sampling moment.
2) And extracting fundamental wave current, 5 th harmonic wave current and 7 th harmonic wave current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter by adopting a vector divider.
Specifically, the fundamental wave current, the 5 th harmonic current and the 7 th harmonic current of the three-phase energy storage converter are:
wherein,the fundamental wave current, the 5 th harmonic wave current and the 7 th harmonic wave current of the three-phase energy storage converter at the kth sampling moment are respectively; t (·) is the transfer matrix.
More specifically, the transfer matrix is:
where x is the input of the transfer matrix, sin is the sine operation, cos is the cosine budget.
3) And a fundamental wave tracking-harmonic wave compensation controller is adopted, and the control quantity of the three-phase energy storage converter is determined according to the extracted fundamental wave current, 5 th harmonic wave current and 7 th harmonic wave current of the three-phase energy storage converter, so that the fundamental wave current tracking and the 5 th harmonic wave and 7 th harmonic wave suppression of the three-phase energy storage converter are realized.
Specifically, the control quantity of the three-phase energy storage converter is as follows:
wherein u is α 、u β The control quantity of the alpha axis and the control quantity of the beta axis of the three-phase energy storage converter are respectively; θ is the grid voltage phase; PI (·) is a PI controller, and:
PI(e)＝k p e+k i ∫edt (9)
wherein e is the PI controller input; k (k) p Is a proportionality coefficient; k (k) i Is an integral coefficient.
More specifically, the scaling factor k of the PI controller p =20, integral coefficient k i =2.5; 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 according to the control quantity of the three-phase energy storage converter by adopting a space proper pulse width modulation algorithm, wherein the space proper pulse width modulation algorithm is disclosed in the prior art, and the specific process is not repeated here.
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.
The current extraction module is used for extracting fundamental wave current, 5 th harmonic wave current and 7 th harmonic wave current of the three-phase energy storage converter according to the reconstructed output current of the three-phase energy storage converter by adopting the vector divider.
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, 5 th harmonic current and 7 th harmonic current of the three-phase energy storage converter by adopting the fundamental wave tracking-harmonic compensation controller, and further determining the switching signals of the three-phase energy storage converter.
Example 3
The present embodiment provides a processing device corresponding to the harmonic suppression method of the three-phase energy storage converter provided in the present embodiment 1, where the processing device may be a processing device for a client, for example, a mobile phone, a notebook computer, a tablet computer, a desktop computer, or the like, so as to execute the method of embodiment 1.
The processing device 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 communication among each other. The memory stores a computer program that can be run on a processing device, and when the processing device runs the computer program, the method for suppressing the harmonic wave of the three-phase energy storage converter provided in this embodiment 1 is executed.
In some implementations, the memory may be high-speed random access memory (RAM: random Access Memory), and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
In other implementations, the processor may be a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or other general-purpose processor, which is not limited herein.
Example 4
The present embodiment provides a computer program product corresponding to the three-phase energy storage converter harmonic suppression method provided in the present embodiment 1, and the computer program product may include a computer readable storage medium having computer readable program instructions for executing the three-phase energy storage converter harmonic suppression method described in the present embodiment 1.
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 storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any combination of the preceding.
The foregoing embodiments are only for illustrating the present invention, wherein the structures, connection modes, manufacturing processes, etc. of the components may be changed, and all equivalent changes and modifications performed on the basis of the technical solutions of the present invention should not be excluded from the protection scope of the present invention.
Claims (6)
1. The method for suppressing the harmonic waves of the three-phase energy storage converter is characterized by comprising the following steps of:
reconstructing an output current of the three-phase energy storage converter, comprising:
collecting three-phase output current of a three-phase energy storage converter;
respectively constructing three-phase output ampere meters of the three-phase energy storage current transformer according to the collected three-phase output currents;
the three-phase output current of the three-phase energy storage converter is respectively determined again through table lookup in a three-phase output ammeter of the three-phase energy storage converter;
determining three-phase reconstruction output current of the three-phase energy storage converter according to the three-phase output current of the three-phase energy storage converter, wherein the three-phase reconstruction output current of the three-phase energy storage converter is as follows:
where k is the sampling instant and k=1, 2,3, …; i.e da (k)、i db (k)、i dc (k) The method comprises the steps of respectively reconstructing an a-phase reconstruction output current, a b-phase reconstruction output current and a c-phase reconstruction output current of the three-phase energy storage converter at a kth sampling moment; f (f) s Is the sampling frequency; int (·) is a rounding operation;respectively the firstA phase a of three-phase energy storage converter with redetermined sampling moments through table lookupOutput current, b-phase output current, c-phase output current;
the three-phase reconstruction output current of the three-phase energy storage converter is determined by adopting an angle rotation algorithm;
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, wherein the fundamental wave current and the harmonic current of the three-phase energy storage converter are as follows:
wherein,the fundamental wave current, the 5 th harmonic wave current and the 7 th harmonic wave current of the three-phase energy storage converter at the kth sampling moment are respectively; t (& gt) is a transfer matrix;
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 for harmonic suppression of a three-phase energy storage converter according to claim 1, wherein determining the control amount of the three-phase energy storage converter according to the extracted fundamental current and harmonic current of the three-phase energy storage converter, and further determining the switching signal of the three-phase energy storage converter comprises:
a vector divider is adopted, and 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 obtaining a switching signal of the three-phase energy storage converter according to the control quantity of the three-phase energy storage converter by adopting a proper amount of space pulse width modulation algorithm.
3. The method for suppressing harmonics of a three-phase energy storage converter according to claim 2, wherein the control amount of the three-phase energy storage converter is:
wherein u is α 、u β The control quantity of the alpha axis and the control quantity of the beta axis of the three-phase energy storage converter are respectively; θ is the grid voltage phase; PI (-) is the PI controller.
4. A three-phase energy storage converter harmonic suppression system, comprising:
the output current rebuilding module is used for rebuilding the output current of the three-phase energy storage converter and comprises the following components:
collecting three-phase output current of a three-phase energy storage converter;
respectively constructing three-phase output ampere meters of the three-phase energy storage current transformer according to the collected three-phase output currents;
the three-phase output current of the three-phase energy storage converter is respectively determined again through table lookup in a three-phase output ammeter of the three-phase energy storage converter;
determining three-phase reconstruction output current of the three-phase energy storage converter according to the three-phase output current of the three-phase energy storage converter, wherein the three-phase reconstruction output current of the three-phase energy storage converter is as follows:
where k is the sampling instant and k=1, 2,3, …; i.e da (k)、i db (k)、i dc (k) The method comprises the steps of respectively reconstructing an a-phase reconstruction output current, a b-phase reconstruction output current and a c-phase reconstruction output current of the three-phase energy storage converter at a kth sampling moment; f (f) s Is the sampling frequency; int (·) is a rounding operation;respectively the firstA phase a output current, a phase b output current and a phase c output current of the three-phase energy storage converter are redetermined by looking up a table at each sampling moment;
the three-phase reconstruction output current of the three-phase energy storage converter is determined by adopting an angle rotation algorithm;
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 fundamental wave current and the harmonic current of the three-phase energy storage converter are as follows:
wherein,the fundamental wave current, the 5 th harmonic wave current and the 7 th harmonic wave current of the three-phase energy storage converter at the kth sampling moment are respectively; t (& gt) is a transfer matrix;
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 signals of the three-phase energy storage converter.
5. A processing device comprising computer program instructions, wherein the computer program instructions, when executed by the processing device, are for implementing the steps corresponding to the method for harmonic rejection of a three-phase energy storage converter according to any one of claims 1-3.
6. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon computer program instructions, wherein the computer program instructions, when executed by a processor, are for implementing the steps corresponding to the method for harmonic rejection of a three-phase energy storage converter according to any of claims 1-3.
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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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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