CN108599218B - Energy storage variable flow system for island micro-grid, control method and medium thereof - Google Patents
Energy storage variable flow system for island micro-grid, control method and medium thereof Download PDFInfo
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- 238000004146 energy storage Methods 0.000 title claims abstract description 105
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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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- 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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- 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 provides an energy storage conversion system for an island-type micro-grid, a control method and a medium thereof, wherein the energy storage conversion system comprises: the energy storage battery (1) is used for storing or releasing direct-current electric energy; the fundamental wave channel (2) is connected with the energy storage battery (1) and is used for supplying power to the three-phase load (E); a harmonic channel (3) connected with the energy storage battery (1) and used for supplying power to the three-phase load (E); a filter capacitor (4) connected with the fundamental wave channel (2) and the harmonic wave channel (3) and used for adjusting the cut-off frequency of the fundamental wave channel (2) and the harmonic wave channel (3); and the control circuit (5) is connected with the fundamental wave channel (2) and the harmonic channel (3) and is used for performing closed-loop control on the fundamental wave channel (2) and the harmonic channel (3) according to the voltage and the inductive current of the three-phase load (E). The capacity of carrying nonlinear load is strong, and the output voltage waveform quality is good.
Description
Technical Field
The invention relates to the technical field of smart grids, in particular to an energy storage converter (PCS) for an island-type micro-grid, which is applicable to different types of loads, and particularly relates to an energy storage converter system for the island-type micro-grid, a control method and a medium thereof.
Background
With the continuous development of new energy technology, especially the development and utilization of wind energy and solar energy, the energy flow of the power grid fluctuates, and a great challenge is presented to the stability of the power grid, so that in order to make the power grid more stable and stronger, a device is required to play a role in peak clipping and valley filling on the power grid energy, and in such a background, a power grid energy storage system is generated.
The energy storage control system is used as an important component of the power grid energy storage system, is widely applied to new energy power generation and island type micro-grid systems, is used for solving the problems of small inertia and weak disturbance resistance of the micro-grid, reduces the influence of the intermittence of renewable energy power generation on the stability of the new energy power generation and island type micro-grid systems, and ensures that the micro-grid has certain predictability and schedulability. In an island micro-grid system, a nonlinear load is arranged besides a linear load, a large number of distributed power supplies are connected into a power grid through power electronic equipment, the equipment is a main source of harmonic current, the voltage and the frequency of the island micro-grid system can be influenced, serious harmonic pollution is caused, and even the normal operation of other equipment is influenced.
At present, an independent device, namely an Active Power Filter (APF), is generally adopted at home and abroad to eliminate specific subharmonics in a power grid. The additional active power filter can eliminate a large amount of harmonic current generated by nonlinear load, but the method can greatly increase the hardware cost of the power grid energy storage system, and cannot be widely popularized and applied in market society at all.
In an island micro-grid, an existing energy storage converter (PCS, also called an energy storage controller) can bear the supporting function of an ac bus voltage, convert dc electric energy of an energy storage battery into three-phase ac electric energy, and supply power to a three-phase load. In general, when the three-phase output voltage waveform of the energy storage converter has good sine degree and THD (total harmonic distortion) is small, the capacity of carrying nonlinear load is weak; when the energy storage converter has strong capacity of carrying nonlinear load, the three-phase output voltage waveform sine degree is poor when the energy storage converter carries resistive load, and THD is large.
Therefore, in order to enable the island-type micro-grid to operate normally, a skilled person is required to develop an energy storage and conversion system for the island-type micro-grid, which can ensure high-quality alternating current bus voltage and meet power supply requirements of a large number of nonlinear loads.
Disclosure of Invention
In view of the above, the technical problem to be solved by the invention is to provide an energy storage converter system for an island-type micro-grid, a control method and a medium thereof, and the problem that the existing energy storage converter cannot consider both output voltage waveform quality and nonlinear load capacity is solved.
In order to solve the above technical problems, a specific embodiment of the present invention provides an energy storage conversion system for an island-type micro-grid, including: the energy storage battery is used for storing or releasing direct-current electric energy; the fundamental wave channel is connected with the energy storage battery and is used for supplying power to the three-phase load; the harmonic channel is connected with the energy storage battery and is used for supplying power to the three-phase load; the filter capacitor is connected with the fundamental wave channel and the harmonic wave channel and is used for adjusting the cut-off frequencies of the fundamental wave channel and the harmonic wave channel; the control circuit is connected with the fundamental wave channel and the harmonic wave channel and is used for performing closed-loop control on the fundamental wave channel according to the voltage of the three-phase load and the inductance current of the fundamental wave channel and performing closed-loop control on the harmonic wave channel according to the voltage of the three-phase load and the inductance current of the harmonic wave channel.
The invention further provides a control method of the energy storage converter system for the island micro-grid, which comprises the following steps: sampling the voltage of the three-phase load; sampling fundamental wave three-phase inductance current of a fundamental wave channel; sampling harmonic three-phase inductance current of a harmonic channel; performing closed-loop control on the fundamental wave channel according to the voltage and the fundamental wave three-phase inductance current; and carrying out closed-loop control on the harmonic channel according to the voltage and the harmonic three-phase inductance current.
Another embodiment of the present invention also provides a computer storage medium containing computer-executable instructions that, when processed by a data processing apparatus, perform a method for controlling an energy storage conversion system for an island-type micro-grid.
According to the specific embodiment of the invention, the energy storage converter system for the island-type micro-grid, the control method and the medium thereof have at least the following beneficial effects: the power supply system has the advantages that the power demand of the load is met, meanwhile, the active output function of the energy storage converter can be achieved through the addition of the harmonic channel and the control algorithm, the capacity of the energy storage control with the nonlinear load can be improved, the power fluctuation of renewable energy sources can be stabilized rapidly, the power quality requirement of island-type micro-grid operation is met, and the power demand of the nonlinear load is met to the greatest extent.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the scope of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic structural diagram of an embodiment of an energy storage conversion system for an island-type micro-grid according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of an embodiment two of an energy storage conversion system for an island-type micro-grid according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a fundamental wave channel according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a harmonic channel according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a filter capacitor according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a control circuit according to an embodiment of the present invention.
Fig. 7 is a flowchart of a control method of an energy storage converter system for an island-type micro-grid according to an embodiment of the present invention.
Reference numerals illustrate:
1 energy storage battery 2 fundamental wave channel
3 harmonic channel 4 filter capacitor
5 control circuit 6 isolation transformer
E three-phase load 21 first transistor
22 second transistor 23 third transistor
24 fourth transistor 25 fifth transistor
26 sixth transistor 27 first inductor
28 second inductance 29 third inductance
31 seventh transistor 32 eighth transistor
33 ninth transistor 34 tenth transistor
35 eleventh transistor 36 twelfth transistor
37 fourth inductance 38 fifth inductance
39 sixth inductor 41 first capacitor
42 second capacitor 43 third capacitor
501. First subtractor 502 voltage regulator
503. Low pass filter 504 second subtractor
505. First current regulator 506 first pulse width modulator
507. Third subtractor 508 fourth subtractor
509. Second current regulator 510 second pulse width modulator
511 first 3/2 converter 512 second 3/2 converter
513 third 3/2 converter
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the spirit of the present disclosure will be clearly described in the following drawings and detailed description, and any person skilled in the art, after having appreciated the embodiments of the present disclosure, may make alterations and modifications by the techniques taught by the present disclosure without departing from the spirit and scope of the present disclosure.
The exemplary embodiments of the present invention and the descriptions thereof are intended to illustrate the present invention, but not to limit the present invention. In addition, the same or similar reference numerals are used for the same or similar parts in the drawings and the embodiments.
The terms "first," "second," …, and the like, as used herein, do not denote a particular order or sequence, nor are they intended to limit the invention, but rather are merely used to distinguish one element or operation from another in the same technical term.
With respect to directional terms used herein, for example: upper, lower, left, right, front or rear, etc., are merely references to the directions of the drawings. Thus, directional terminology is used for purposes of illustration and is not intended to be limiting.
As used herein, the terms "comprising," "including," "having," "containing," and the like are intended to be inclusive and mean an inclusion, but not limited to.
As used herein, "and/or" includes any or all combinations of such things.
Reference herein to "a plurality" includes "two" and "more than two"; the term "plurality of sets" as used herein includes "two sets" and "more than two sets".
The terms "about," "approximately" and the like as used herein are used to modify any quantitative or positional deviation that could vary slightly without such slight variation or positional deviation altering its nature. In general, the range of slight variations or errors modified by such terms may be 20% in some embodiments, 10% in some embodiments, 5% in some embodiments, or other values. It should be understood by those skilled in the art that the above mentioned values can be adjusted according to the actual requirements, and are not limited thereto.
Certain terms used to describe the application will be discussed below, or elsewhere in this specification, to provide additional guidance to those skilled in the art in connection with the description of the application.
Fig. 1 is a schematic structural diagram of an embodiment of an energy storage converter system for an island micro-grid according to an embodiment of the present invention, where, as shown in fig. 1, an energy storage battery stores or releases electric energy generated by a solar power generation device or a wind power generation device, and a control circuit performs closed-loop control on a fundamental wave channel according to a voltage of a three-phase load and an inductance of the fundamental wave channel, and performs closed-loop control on a harmonic wave channel according to a voltage of the three-phase load and an inductance of the harmonic wave channel.
In the specific embodiment shown in the figure, the energy storage conversion system for an island-type micro-grid comprises: the energy storage battery 1, the fundamental wave channel 2, the harmonic wave channel 3, the filter capacitor 4 and the control circuit 5. The energy storage battery 1 is used for storing or releasing direct-current electric energy; the fundamental wave channel 2 is connected with the energy storage battery 1, and the fundamental wave channel 2 is used for supplying power to the three-phase load E; the harmonic channel 3 is connected with the energy storage battery 1, and the harmonic channel 3 is used for supplying power to the three-phase load E; the filter capacitor 4 is connected with the fundamental wave channel 2 and the harmonic wave channel 3, and the filter capacitor 4 is used for adjusting the cut-off frequencies of the fundamental wave channel 2 and the harmonic wave channel 3; the control circuit 5 is connected with the fundamental wave channel 2 and the harmonic wave channel 3, and the control circuit 5 is used for performing closed-loop control on the fundamental wave channel 2 according to the voltage of the three-phase load E and the inductance current of the fundamental wave channel 2, and performing closed-loop control on the harmonic wave channel 3 according to the voltage of the three-phase load E and the inductance current of the harmonic wave channel 3. In an embodiment of the present invention, the energy storage battery 1 may be a lead-acid battery or a lithium ion battery; the three-phase load E may be a linear load or a nonlinear load; the control circuit 5 performs closed-loop control on the fundamental wave channel 2 according to the voltage of the three-phase load E in combination with the inductance current of the fundamental wave channel 2; the control circuit 5 performs closed-loop control on the harmonic channel 3 according to the voltage of the three-phase load E and in combination with the inductance current of the harmonic channel 3, provides voltage for the three-phase load E based on the characteristics of the three-phase load E, meets the power requirement of the load to the maximum extent, and can quickly stabilize the power fluctuation of renewable energy sources. The transistors in the fundamental wave channel 2 and the harmonic wave channel 3 are Insulated Gate Bipolar Transistors (IGBT). The cut-off frequency of the filter of the fundamental channel 2 is smaller than the cut-off frequency of the filter of the harmonic channel 3. The energy storage converter (PCS) comprises a fundamental wave channel 2, a harmonic wave channel 3, a filter capacitor 4, a control circuit 5 and the like; the energy storage current transformation system comprises an energy storage current transformer, an energy storage battery 1 and the like.
Referring to fig. 1, a control circuit 5 performs closed-loop control on a fundamental wave channel according to the voltage of a three-phase load E and the three-phase inductance current of the fundamental wave channel; the control circuit 5 performs closed-loop control on the harmonic channel according to the voltage of the three-phase load E and the three-phase inductance current of the harmonic channel, and the energy storage converter can ensure to output high-quality three-phase alternating voltage no matter what three-phase load E; the active output power of the energy storage converter can be realized, and the capacity of the energy storage converter with nonlinear load can be improved.
Fig. 2 is a schematic structural diagram of a second embodiment of an energy storage converter system for an island-type micro-grid according to an embodiment of the present invention, as shown in fig. 2, an isolation transformer is added between a filter capacitor and a three-phase load, so as to achieve electrical isolation and improve the capability of the energy storage converter with unbalanced load.
In the embodiment shown in the figure, the energy storage converter system for an island-type micro-grid further comprises an isolation transformer 6. The isolation transformer 6 is arranged between the filter capacitor 4 and the three-phase load E, and the isolation transformer 6 is used for realizing electric isolation and improving the capacity of the energy storage converter with unbalanced load. In the embodiment of the invention, the output end and the input end of the isolation transformer 6 are completely isolated in an 'open circuit', so that a good filtering effect is effectively achieved on the input end (the power supply voltage supplied by the fundamental wave channel 2 and the harmonic channel 3) of the isolation transformer 6, and a pure power supply voltage is provided for the three-phase load E.
Referring to fig. 2, the isolation transformer 6 is used for realizing electrical isolation and improving the capability of the energy storage converter with unbalanced load, providing pure power supply voltage for the three-phase load E, and the energy storage converter is stable and reliable in operation.
Fig. 3 is a schematic structural diagram of a fundamental wave channel provided in an embodiment of the present invention, and as shown in fig. 3, the fundamental wave channel is composed of six transistors and three inductors, and a control circuit controls on/off of the transistors by applying high and low levels to gates of the transistors.
In the embodiment shown in the figure, the fundamental wave channel 2 specifically includes: the first transistor 21, the second transistor 22, the third transistor 23, the fourth transistor 24, the fifth transistor 25, the sixth transistor 26, the first inductance 27, the second inductance 28, and the third inductance 29. Wherein the source electrode of the first transistor 21 is connected with the positive electrode of the energy storage battery; a source of a second transistor 22 is connected with a drain of the first transistor 21, and a drain of the second transistor 22 is connected with a cathode of the energy storage battery 1; the source electrode of the third transistor 23 is connected with the positive electrode of the energy storage battery 1; a source of the fourth transistor 24 is connected to a drain of the third transistor 23, and a drain of the fourth transistor 24 is connected to a negative electrode of the energy storage cell 1; fifth transistor 25, the source electrode is connected with the positive electrode of the energy storage battery 1; a source of a sixth transistor 26 is connected to a drain of the fifth transistor 25, and a drain of the sixth transistor 26 is connected to a negative electrode of the energy storage battery 1; one end of a first inductor 27 is connected with the drain electrode of the first transistor 21, and the other end of the first inductor 27 is connected with the filter capacitor 4; one end of the second inductor 28 is connected with the drain electrode of the third transistor 23, and the other end of the second inductor 28 is connected with the filter capacitor 4; one end of the third inductor 29 is connected to the drain of the fifth transistor 25, and the other end of the third inductor 29 is connected to the filter capacitor 4. In an embodiment of the present invention, the transistor may be an Insulated Gate Bipolar Transistor (IGBT); the inductance values of the first inductance 27, the second inductance 28, and the third inductance 29 may be the same. I abc1 Is a sampled value of the three-phase inductor current of the fundamental wave channel 2.
Referring to fig. 3, the on-off of the transistors in the fundamental wave channel 2 is controlled according to the voltage of the three-phase load and the three-phase inductance current of the fundamental wave channel 2, i.e., the fundamental wave channel 2 is closed-loop controlled according to the voltage of the three-phase load E and the three-phase inductance current of the fundamental wave channel 2.
Fig. 4 is a schematic structural diagram of a harmonic channel according to an embodiment of the present invention, where, as shown in fig. 4, the harmonic channel is composed of six transistors and three inductors, and a control circuit controls on/off of the transistors by applying high and low levels to gates of the transistors.
In the embodiment shown in the figure, the harmonic channel 3 specifically includes: a seventh transistor 31, an eighth transistor 32, a ninth transistor 33, a tenth transistor 34, an eleventh transistor 35, a twelfth transistor 36, a fourth inductance 37, a fifth inductance 38, and a sixth inductance 39. Wherein the source electrode of the seventh transistor 31 is connected with the positive electrode of the energy storage battery 1; a source of the eighth transistor 32 is connected to a drain of the seventh transistor 31, and a drain of the eighth transistor 32 is connected to a negative electrode of the energy storage battery 1; a source electrode of the ninth transistor 33 is connected to the positive electrode of the energy storage battery 1; a source of a tenth transistor 34 is connected to a drain of the ninth transistor 33, and a drain of the tenth transistor 34 is connected to a negative electrode of the energy storage battery 1; eleventh transistor 35, the source electrode is connected with the positive electrode of the energy storage battery 1; a source of a twelfth transistor 36 is connected to the drain of the eleventh transistor 35, and a drain of the twelfth transistor 36 is connected to the negative electrode of the energy storage cell 1; one end of a fourth inductor 37 is connected with the drain electrode of the seventh transistor 31, and the other end of the fourth inductor 37 is connected with the filter capacitor 4; one end of a fifth inductor 38 is connected with the drain electrode of the ninth transistor 33, and the other end of the fifth inductor 38 is connected with the filter capacitor 4; one end of the sixth inductor 39 is connected to the drain of the eleventh transistor 35, and the other end of the sixth inductor 39 is connected to the filter capacitor 4. In an embodiment of the present invention, the transistor may be an Insulated Gate Bipolar Transistor (IGBT); the inductance values of the fourth inductance 37, the fifth inductance 38, and the sixth inductance 39 may be the same. I abc2 Is a sampled value of the three-phase inductor current of the harmonic channel 3.
Referring to fig. 4, on-off of transistors in the harmonic channel 3 is controlled according to the voltage of the three-phase load E and the three-phase inductance current of the harmonic channel 3, that is, the harmonic channel 3 is closed-loop controlled according to the voltage of the three-phase load E and the three-phase inductance current of the harmonic channel 3, and the fundamental wave channel 2 and the harmonic channel 3 are closed-loop independently according to the given current of the channel and the inductance current of the channel respectively.
Fig. 5 is a schematic structural diagram of a filter capacitor according to an embodiment of the present invention, as shown in fig. 5, the filter capacitor is composed of three capacitors, one ends of the three capacitors are connected together, and the other ends of the three capacitors are respectively connected with a first inductor, a second inductor and a third inductor.
In the embodiment shown in the figure, the filter capacitor 4 specifically includes: a first capacitor 41, a second capacitor 42 and a third capacitor 43. Wherein one end of the first capacitor 41 is connected to the first inductor 27; one end of a second capacitor 42 is connected to the second inductor 28; one end of the third capacitor 43 is connected to the third inductor 29. Wherein the other ends of the first capacitor 41, the second capacitor 42 and the third capacitor 43 are connected together. In the embodiment of the present invention, the capacitances of the first capacitor 41, the second capacitor 42, and the third capacitor 43 are equal.
Referring to fig. 5, three capacitors are used to form a filter capacitor 4, the filter capacitor 4 is shared by the fundamental wave channel 2 and the harmonic channel 3, and the cutoff frequency of the fundamental wave channel 2 is determined by adjusting the first inductor 27, the second inductor 28 and the third inductor 29 of the fundamental wave channel 2 and combining with the filter capacitor 4; by adjusting the fourth inductance 37, the fifth inductance 38 and the sixth inductance 39 of the harmonic channel 3, the cut-off frequency of the harmonic channel 3 is determined in combination with the filter capacitance 4, the cut-off frequency of the fundamental channel 2 being smaller than the cut-off frequency of the harmonic channel 3.
Fig. 6 is a schematic structural diagram of a control circuit according to an embodiment of the present invention, as shown in fig. 6, where the control circuit performs closed-loop control on a fundamental wave channel and a harmonic channel according to a voltage sampling value of a three-phase load, a sampling value of a three-phase inductance current of the fundamental wave channel, and a sampling value of a three-phase inductance current of the harmonic channel.
In the embodiment shown in the figure, the control circuit 5 specifically includes: the first 3/2 converter 511, the first subtractor 501, the voltage regulator 502, the low pass filter 503, the second 3/2 converter 512, the second subtractor 504, the first current regulator 505, the first pulse width modulator 506, the third subtractor 507, the third 3/2 converter 513, the fourth subtractor 508, the second current regulator 509, and the second pulse width modulator 510. Wherein a first 3/2 converter 511 is connected to the three-phase load E, the first 3/2 converter 511 is used for converting the sampled voltage V of the three-phase load E abc Obtaining a voltage value V f The method comprises the steps of carrying out a first treatment on the surface of the One input of a first subtracter 501 is connected to the first 3/2 converter 511, the first subtracter 501 being adapted to convert the voltage value V f With reference voltage V ref Making a difference to obtain a voltage difference; a voltage regulator 502 is connected to the output of the first subtractor 501, the voltage regulator 502 being adapted to convert the voltage difference into a three-phase current I ref The three-phase current contains information of load characteristics; a Low Pass Filter (LPF) 503 is connected to the output end of the voltage regulator 502, and the low pass filter 503 is configured to filter out a high frequency part of the three-phase current to obtain a three-phase fundamental wave current reference value; the second 3/2 converter 512 is used for converting the first sampling value I of the three-phase inductance current of the fundamental wave channel 2 abc1 I.e. the first sampled value is the three-phase inductor current of the fundamental wave channel 2Sampling values; one input end of the second subtracter 504 is connected with the second 3/2 converter 512, the other input end of the second subtracter 504 is connected with the output end of the low-pass filter 503, and the second subtracter 504 is used for converting the first sampled value I after conversion abc1 Obtaining a first current difference value by making a difference with the three-phase fundamental current reference value; an input terminal of the first current regulator 505 is connected to an output terminal of the second subtractor 504, and the first current regulator 505 is configured to regulate the first current difference value to a first control voltage; the first pulse width modulator 506 is connected with the first current regulator 505, and the first pulse width modulator 506 is used for controlling the on-off of the transistor in the fundamental wave channel 2 according to the first control voltage; a third subtractor 507 is connected to the voltage regulator 502 and the low-pass filter 503, and the third subtractor 507 is configured to obtain a three-phase harmonic current reference value by differentiating the three-phase current and the three-phase fundamental current reference value; a third 3/2 converter 513 is arranged to convert a second sampled value I of the three-phase inductor current of the harmonic channel 3 abc2 The second sampling value is the sampling value of the three-phase inductance current of the harmonic channel 3; one input end of the fourth subtracter 508 is connected with the third 3/2 converter 513, the other input end of the fourth subtracter 508 is connected with the output end of the third subtracter 507, and the fourth subtracter 508 is used for obtaining a second current difference value by making a difference between the transformed second sampling value and the three-phase harmonic current reference value; an input terminal of a second current regulator 509 is connected to an output terminal of the fourth subtractor 508, and the second current regulator 509 is configured to regulate the second current difference value to a second control voltage; a second pulse width modulator 510 is connected to the second current regulator 509, where the second pulse width modulator 510 is configured to control on-off of a transistor in the harmonic channel 3 according to the second control voltage. In an embodiment of the invention, the pulse width modulator is a Pulse Width Modulator (PWM).
Referring to fig. 6, the fundamental channel control principle is as follows: sampling the voltage of a three-phase load E, converting the voltage by a 3/2 converter to obtain a voltage value, and performing difference between the voltage value and a reference voltage to obtain a voltage difference, wherein the obtained voltage difference is subjected to a voltage regulator to obtain a three-phase reference current, and the three-phase reference current contains information of load characteristics; the three-phase reference current is subjected to a Low Pass Filter (LPF) to obtain a three-phase fundamental wave current reference value; the three-phase fundamental wave current reference value subtracts the sampling value (namely the first sampling value) of the three-phase inductance current of the fundamental wave channel, and then the current regulator and PWM are used for realizing closed-loop control of the inductance current of the fundamental wave channel, namely the fundamental wave channel outputs the fundamental wave current. The harmonic channel control principle is as follows: sampling the voltage of a three-phase load E, transforming the voltage by a 3/2 converter to obtain a voltage value, obtaining a voltage difference by making a difference between the voltage value and a reference voltage, and obtaining a three-phase reference current after the obtained voltage difference passes through a voltage regulator, wherein the three-phase reference current contains information of load characteristics; subtracting the three-phase fundamental wave current reference value from the three-phase current (the three-phase fundamental wave current reference value and the three-phase harmonic current reference value are overlapped to obtain a three-phase reference current); the sampling value (namely a second sampling value) of the three-phase inductance current of the harmonic channel is subtracted from the three-phase harmonic current reference value, and then the closed-loop control of the harmonic channel inductance current is realized through the current regulator and PWM, namely the harmonic channel outputs the harmonic current. The fundamental wave channel and the harmonic channel can be closed-loop controlled no matter whether the three-phase load is linear or nonlinear, the capacity of the energy storage converter with the nonlinear load can be enhanced, the reactive compensation capacity of the energy storage converter can be enhanced, and the energy storage converter can be simply connected in parallel; the inductance of the fundamental wave channel and the harmonic channel are differentiated, so that the energy storage converter can easily realize random collocation of active current and harmonic current.
In a further embodiment of the invention, the cut-off frequency point f of the fundamental channel 2 Base group The calculation formula of (2) is as follows:
wherein L is 1 The inductance value of the first inductor; c (C) 1 A capacitance value of the first capacitor; f (f) 1 Is the fundamental frequency; f (f) 2 Is a harmonic frequency.
Cut-off frequency point f of the harmonic channel 3 Harmonic wave Is calculated by the formula of (2)The method comprises the following steps:
wherein L is 2 The inductance value of the fourth inductor; c (C) 2 A capacitance value of the first capacitor; f (f) 1 Is the fundamental frequency; f (f) 2 Is a harmonic frequency; f (f) Base group ＜f Harmonic wave 。
Fig. 7 is a flowchart of a control method of an energy storage converter system for an island-type micro-grid according to an embodiment of the present invention, where as shown in fig. 7, a fundamental wave channel is closed-loop controlled according to a voltage of a three-phase load and a fundamental wave three-phase inductance current of the fundamental wave channel, and a harmonic channel is closed-loop controlled according to a voltage of the three-phase load and a harmonic three-phase inductance current of the harmonic channel.
In the specific embodiment shown in the figure, the control method for the energy storage converter system of the island-type micro-grid comprises the following steps:
step 101: the voltages of the three-phase load are sampled. In an embodiment of the present invention, the three-phase load may be a linear load or a nonlinear load.
Step 102: and sampling the fundamental wave three-phase inductance current of the fundamental wave channel. In the embodiment of the invention, the fundamental wave three-phase inductance current is specifically the current value of the inductance in the fundamental wave channel.
Step 103: and sampling harmonic three-phase inductance current of the harmonic channel. In the embodiment of the invention, the harmonic three-phase inductance current is specifically the current value of the inductance in the harmonic channel.
Step 104: and carrying out closed-loop control on the fundamental wave channel according to the voltage and the fundamental wave three-phase inductive current. In the embodiment of the invention, the on-off of the fundamental wave channel is controlled by controlling the grid electrode of the transistor in the fundamental wave channel.
Step 105: and carrying out closed-loop control on the harmonic channel according to the voltage and the harmonic three-phase inductance current. In the embodiment of the invention, the on-off of the fundamental wave channel is controlled by controlling the grid electrode of the transistor in the harmonic wave channel.
Referring to fig. 7, the filter cut-off frequency of the fundamental channel is made smaller than that of the harmonic channel by a reasonable filter design. The energy storage converter can ensure that high-quality three-phase alternating voltage is output regardless of load type.
In other embodiments of the present invention, step 104 specifically includes: converting the voltage to a voltage value using a first 3/2 converter; utilizing a first subtracter to make a difference between the voltage value and a reference voltage to obtain a voltage difference; converting the voltage difference into three-phase current using a voltage regulator; filtering a high-frequency part in the three-phase current by using a low-pass filter to obtain a three-phase fundamental wave current reference value; transforming the three-phase induction current sampled from the fundamental wave channel by using a second 3/2 converter to obtain a fundamental wave three-phase induction current; utilizing a second subtracter to perform difference between the three-phase fundamental wave current reference value and the fundamental wave three-phase inductance current to obtain a first current difference value; adjusting the first current difference to a first control voltage with a first current regulator; and controlling the on-off of the transistor in the fundamental wave channel according to the first control voltage by using a first pulse width modulator.
Step 105 specifically includes: converting the voltage to a voltage value using a first 3/2 converter; utilizing a first subtracter to make a difference between the voltage value and a reference voltage to obtain a voltage difference; converting the voltage difference into three-phase current using a voltage regulator; filtering a high-frequency part in the three-phase current by using a low-pass filter to obtain a three-phase fundamental wave current reference value; utilizing a third subtracter to make a difference between the three-phase current and the three-phase fundamental wave current reference value to obtain a three-phase harmonic current reference value; transforming the three-phase induction current sampled from the harmonic channel by using a third 3/2 converter to obtain harmonic three-phase induction current; utilizing a fourth subtracter to perform difference between the three-phase harmonic current reference value and the harmonic three-phase inductance current to obtain a second current difference value; regulating the second current difference to a second control voltage with a second current regulator; and controlling the on-off of the transistor in the harmonic channel according to the second control voltage by using a second pulse width modulator.
The specific embodiment of the invention provides a computer storage medium containing computer-executable instructions, wherein the computer-executable instructions, when processed by data processing equipment, execute a control method for an energy storage conversion system of an island-type micro-grid. The method comprises the following steps:
step 101: the voltages of the three-phase load are sampled.
Step 102: and sampling the fundamental wave three-phase inductance current of the fundamental wave channel.
Step 103: and sampling harmonic three-phase inductance current of the harmonic channel.
Step 104: and carrying out closed-loop control on the fundamental wave channel according to the voltage and the fundamental wave three-phase inductive current.
Step 105: and carrying out closed-loop control on the harmonic channel according to the voltage and the harmonic three-phase inductance current.
The embodiment of the invention provides an energy storage converter system for an island-type micro-grid, a control method thereof and a storage medium, which are used for meeting the load power requirement, and simultaneously adding a harmonic channel and a control algorithm, wherein the energy storage converter system is not only capable of realizing the active output function of the energy storage converter, but also capable of improving the capacity of energy storage control with the nonlinear load, and rapidly stabilizing the power fluctuation of renewable energy sources, so that the energy quality requirement of the island-type micro-grid operation is met, and the power requirement of the nonlinear load is also met to the maximum extent.
The embodiments of the invention described above may be implemented in various hardware, software code or a combination of both. For example, embodiments of the invention may also be program code for performing the above-described methods in a data signal processor (Digital Signal Processor, DSP). The invention may also relate to various functions performed by a computer processor, digital signal processor, microprocessor, or field programmable gate array (Field Programmable Gate Array, FPGA). The processor described above may be configured in accordance with the present invention to perform specific tasks by executing machine readable software code or firmware code that defines the specific methods disclosed herein. The software code or firmware code may be developed in different programming languages and in different formats or forms. The software code may also be compiled for different target platforms. However, the different code patterns, types and languages of software code and other types of configuration code that perform tasks according to the invention do not depart from the spirit and scope of the invention.
The foregoing is merely illustrative of the embodiments of this invention and any equivalent and equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention.
Claims (8)
1. An energy storage conversion system for an island-type micro-grid, the energy storage conversion system comprising:
the energy storage battery (1) is used for storing or releasing direct-current electric energy;
the fundamental wave channel (2) is connected with the energy storage battery (1) and is used for supplying power to the three-phase load (E);
the harmonic channel (3) is connected with the energy storage battery (1) and is used for supplying power to the three-phase load (E), and transistors in the fundamental channel (2) and the harmonic channel (3) are insulated gate bipolar transistors;
a filter capacitor (4) connected to the fundamental wave channel (2) and the harmonic wave channel (3) for adjusting the cut-off frequencies of the fundamental wave channel (2) and the harmonic wave channel (3); and
a control circuit (5) connected with the fundamental wave channel (2) and the harmonic wave channel (3) and used for performing closed-loop control on the fundamental wave channel (2) according to the voltage of the three-phase load (E) and the inductance current of the fundamental wave channel (2) and performing closed-loop control on the harmonic wave channel (3) according to the voltage of the three-phase load (E) and the inductance current of the harmonic wave channel (3),
the control circuit (5) specifically includes:
a first subtracter (501) with one input end connected with the three-phase load (E) and used for obtaining a voltage difference by making a difference between the voltage value of the three-phase load (E) and a reference voltage;
a voltage regulator (502) connected to an output of the first subtractor (501) for converting the voltage difference into a three-phase current;
the low-pass filter (503) is connected with the output end of the voltage regulator (502) and is used for filtering out a high-frequency part in the three-phase current to obtain a three-phase fundamental wave current reference value;
a second subtracter (504), one input end of which is connected with the inductance of the fundamental wave channel (2), and the other input end of which is connected with the output end of the low-pass filter (503), and is used for obtaining a first current difference value by making a difference between a first sampling value of the three-phase inductance current of the fundamental wave channel (2) and the three-phase fundamental wave current reference value;
a first current regulator (505) having an input connected to an output of the second subtractor (504) for regulating the first current difference to a first control voltage;
a first pulse width modulator (506) connected with the first current regulator (505) and used for controlling the on-off of the transistors in the fundamental wave channel (2) according to the first control voltage;
a third subtractor (507) connected to the voltage regulator (502) and the low-pass filter (503) and configured to obtain a three-phase harmonic current reference value by differentiating the three-phase current and the three-phase fundamental current reference value;
a fourth subtracter (508) with one input end connected with the inductance of the harmonic channel (3), and the other input end connected with the output end of the third subtracter (507), and the fourth subtracter is used for obtaining a second current difference value by making a difference between a second sampling value of the three-phase inductance current of the harmonic channel (3) and the three-phase harmonic current reference value;
a second current regulator (509) having an input coupled to the output of the fourth subtractor (508) for regulating the second current difference to a second control voltage;
a second pulse width modulator (510) connected with the second current regulator (509) and used for controlling the on-off of the transistors in the harmonic channel (3) according to the second control voltage;
a first 3/2 converter (511) disposed between the three-phase load (E) and the first subtractor (501) for converting the sampled voltage of the three-phase load (E) to a voltage value;
a second 3/2 converter (512) disposed between the inductance of the fundamental wave channel (2) and the second subtractor (504) for converting a first sampled value of the three-phase inductance current of the fundamental wave channel (2); and
and a third 3/2 converter (513) disposed between the inductance of the harmonic channel (3) and the fourth subtractor (508) for converting a second sampled value of the three-phase inductance current of the harmonic channel (3).
2. The energy storage conversion system for an island-type microgrid of claim 1, further comprising:
and the isolation transformer (6) is arranged between the filter capacitor (4) and the three-phase load (E) and is used for realizing electric isolation and improving the capacity of the energy storage converter with unbalanced load.
3. Energy storage converter system for island micro-grids according to claim 1, characterized in that the fundamental channel (2) comprises in particular:
a first transistor (21) having a source connected to the positive electrode of the energy storage battery (1);
a second transistor (22) having a source connected to the drain of the first transistor (21), the drain of the second transistor (22) being connected to the negative electrode of the energy storage battery (1);
a third transistor (23) having a source connected to the positive electrode of the energy storage cell (1);
a fourth transistor (24) having a source connected to the drain of the third transistor (23), the drain of the fourth transistor (24) being connected to the negative electrode of the energy storage cell (1);
a fifth transistor (25) having a source connected to the positive electrode of the energy storage cell (1);
a sixth transistor (26) having a source connected to the drain of the fifth transistor (25), the drain of the sixth transistor (26) being connected to the negative electrode of the energy storage cell (1);
a first inductor (27) having one end connected to the drain of the first transistor (21) and the other end connected to the filter capacitor (4);
a second inductor (28) having one end connected to the drain of the third transistor (23) and the other end connected to the filter capacitor (4); and
and a third inductor (29) having one end connected to the drain of the fifth transistor (25) and the other end connected to the filter capacitor (4).
4. Energy storage converter system for island micro-grids according to claim 3, characterized in that the harmonic channel (3) comprises in particular:
a seventh transistor (31) having a source connected to the positive electrode of the energy storage cell (1);
an eighth transistor (32) having a source connected to the drain of the seventh transistor (31), the drain of the eighth transistor (32) being connected to the negative electrode of the energy storage battery (1);
a ninth transistor (33) having a source connected to the positive electrode of the energy storage battery (1);
a tenth transistor (34) having a source connected to a drain of the ninth transistor (33), the drain of the tenth transistor (34) being connected to a negative electrode of the energy storage battery (1);
an eleventh transistor (35) having a source connected to the positive electrode of the energy storage cell (1);
a twelfth transistor (36) having a source connected to the drain of the eleventh transistor (35), the drain of the twelfth transistor (36) being connected to the negative electrode of the energy storage cell (1);
a fourth inductor (37) having one end connected to the drain of the seventh transistor (31) and the other end connected to the filter capacitor (4);
a fifth inductor (38) having one end connected to the drain of the ninth transistor (33) and the other end connected to the filter capacitor (4); and
and a sixth inductor (39) having one end connected to the drain of the eleventh transistor (35) and the other end connected to the filter capacitor (4).
5. Energy storage converter system for island micro-grids according to claim 4, characterized in that the filter capacitor (4) comprises in particular:
a first capacitor (41) having one end connected to the first inductor (27);
a second capacitor (42) having one end connected to the second inductor (28);
a third capacitor (43) having one end connected to the third inductor (29), wherein,
the other ends of the first capacitor (41), the second capacitor (42) and the third capacitor (43) are connected together.
6. Energy storage converter system for island micro-grids according to claim 5, characterized in that the cut-off frequency point f of the fundamental channel (2) Base group The calculation formula of (2) is as follows:
wherein L is 1 The inductance value of the first inductor; c (C) 1 A capacitance value of the first capacitor; f (f) 1 Is the fundamental frequency; f (f) 2 Is a harmonic frequency;
cut-off frequency point f of the harmonic channel (3) Harmonic wave The calculation formula of (2) is as follows:
wherein L is 2 The inductance value of the fourth inductor; c (C) 2 A capacitance value of the first capacitor; f (f) 1 Is the fundamental frequency; f (f) 2 Is a harmonic frequency; f (f) Base group ＜f Harmonic wave 。
7. A control method for an energy storage variable current system of an island-type micro-grid, the method comprising:
sampling the voltage of the three-phase load;
sampling fundamental wave three-phase inductance current of a fundamental wave channel;
sampling harmonic three-phase inductance current of a harmonic channel;
performing closed-loop control on the fundamental wave channel according to the voltage and the fundamental wave three-phase inductance current; and
the harmonic channel is closed-loop controlled according to the voltage and the harmonic three-phase inductance current,
the step of performing closed-loop control on the fundamental wave channel according to the voltage and the fundamental wave three-phase inductance current specifically comprises the following steps:
converting the voltage to a voltage value using a first 3/2 converter;
utilizing a first subtracter to make a difference between the voltage value and a reference voltage to obtain a voltage difference;
converting the voltage difference into three-phase current using a voltage regulator;
filtering a high-frequency part in the three-phase current by using a low-pass filter to obtain a three-phase fundamental wave current reference value;
transforming the three-phase induction current sampled from the fundamental wave channel by using a second 3/2 converter to obtain a fundamental wave three-phase induction current;
utilizing a second subtracter to perform difference between the three-phase fundamental wave current reference value and the fundamental wave three-phase inductance current to obtain a first current difference value;
adjusting the first current difference to a first control voltage with a first current regulator; and
the first pulse width modulator is utilized to control the on-off of the transistor in the fundamental wave channel according to the first control voltage,
the step of performing closed-loop control on the harmonic channel according to the voltage and the harmonic three-phase inductance current specifically comprises the following steps:
converting the voltage to a voltage value using a first 3/2 converter;
utilizing a first subtracter to make a difference between the voltage value and a reference voltage to obtain a voltage difference;
converting the voltage difference into three-phase current using a voltage regulator;
filtering a high-frequency part in the three-phase current by using a low-pass filter to obtain a three-phase fundamental wave current reference value;
utilizing a third subtracter to make a difference between the three-phase current and the three-phase fundamental wave current reference value to obtain a three-phase harmonic current reference value;
transforming the three-phase induction current sampled from the harmonic channel by using a third 3/2 converter to obtain harmonic three-phase induction current;
utilizing a fourth subtracter to perform difference between the three-phase harmonic current reference value and the harmonic three-phase inductance current to obtain a second current difference value;
regulating the second current difference to a second control voltage with a second current regulator; and
and controlling the on-off of the transistor in the harmonic channel according to the second control voltage by using a second pulse width modulator.
8. A computer storage medium containing computer-executable instructions that, when processed via a data processing apparatus, perform the control method for an energy storage conversion system for an island-type microgrid of claim 7.
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