CN218678827U - Energy storage converter and light storage system - Google Patents
Energy storage converter and light storage system Download PDFInfo
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- CN218678827U CN218678827U CN202223257057.9U CN202223257057U CN218678827U CN 218678827 U CN218678827 U CN 218678827U CN 202223257057 U CN202223257057 U CN 202223257057U CN 218678827 U CN218678827 U CN 218678827U
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The utility model relates to an energy storage converter and light storage system, including isolation transformer, wave filter, power switch device and controller, isolation transformer is connected with the electric wire netting through three-phase switch and is connected with the wave filter through three-phase circuit breaker, and power switch device is connected with the wave filter and is connected with energy storage battery through direct current circuit breaker, and the controller is connected with the power switch device; the controller comprises a processing center, an alternating current detection module and a direct current detection module, wherein the alternating current detection module collects voltage and current parameters of three-phase alternating current and is connected with the processing center through a first signal conditioning circuit, and the direct current detection module collects voltage and current parameters of a direct current breaker and is connected with the processing center through a second signal conditioning circuit. The energy storage converter adopts a PWM modulation technology, realizes electric energy conversion by controlling a converter bridge switching tube, and is matched with a filter to filter out higher harmonics at a large number of switching frequencies on the network side, so that the electric energy quality of the network side is improved.
Description
Technical Field
The utility model relates to an energy storage converter technical field especially relates to an energy storage converter and light storage system.
Background
The energy storage converter is used as a connecting bridge between the direct current side and the alternating current bus side of the energy storage system, so that the absorption and the release of the electric energy of the energy storage system are realized, and the grid-connected charging and discharging and off-grid discharging functions are realized through the bidirectional flow of the electric energy. When the energy storage converter is in a discharging mode, the converter converts the electric energy at the direct current side into stable alternating current with low harmonic content, and provides the electric energy for a load or feeds back to a power grid through a bus; when the energy storage converter is in a charging mode, the converter converts bus alternating current electric energy into stable direct current electric energy to charge the battery.
In the electric energy conversion process, a large amount of higher harmonics are contained in the output current of a converter bridge of the energy storage converter, if the current containing a large amount of higher harmonics is merged into a power grid, the electric energy quality of the power grid on the grid side can be seriously reduced, and electric equipment can be damaged in serious cases.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing an energy storage converter and light storage system to the defect that exists among the prior art exactly.
In order to achieve the above purpose, the utility model adopts the technical scheme that: an energy storage converter and light storage system comprising: the isolation transformer is connected with a power grid through a three-phase switch and connected with the filter through a three-phase breaker, the power switch device is connected with the filter and connected with an energy storage battery through a direct current breaker, and the controller is connected with the power switch device;
the controller comprises a processing center, an alternating current detection module and a direct current detection module, wherein the alternating current detection module collects voltage and current parameters of three-phase alternating current and is connected with the processing center through a first signal conditioning circuit, and the direct current detection module collects voltage and current parameters of the direct current breaker and is connected with the processing center through a second signal conditioning circuit.
Furthermore, the filter is an LCL type filter and comprises a variable current side inductor, a network side inductor and a filter capacitor, wherein the network side inductor is arranged close to the power grid, the variable current side inductor is connected with the network side inductor in series, and the filter capacitor is connected between the variable current side inductor and the network side inductor in parallel.
Furthermore, a damping resistor is connected in series with the filter capacitor.
Furthermore, the alternating current detection module adopts a Hall sensor, and the Hall sensor inputs the acquired voltage signal into the processing center after sequentially passing through the low-pass filter, the voltage following circuit and the biasing circuit.
Furthermore, the processing center is connected with the power switch device and modulates and outputs driving pulses through an SVPWM algorithm to control the power switch device to switch the switching mode.
The light storage system is characterized by comprising a photovoltaic array, a photovoltaic inverter, a direct current bus, a local load, an energy storage battery and the energy storage converter, wherein the direct current bus is connected with the direct current bus through a grid-connected switch, the photovoltaic array is connected with the direct current bus through the photovoltaic inverter, the energy storage battery is connected with the direct current bus through the energy storage converter, and the local load is connected with the energy storage battery in parallel.
The utility model has the advantages that:
in the application, the energy storage converter adopts a PWM (pulse width modulation) technology, realizes electric energy conversion by controlling a switching tube of a converter bridge, and is matched with a filter to filter out high-order harmonics at a large number of switching frequencies on a grid side, so that the quality of electric energy on the grid side is improved;
the damping resistor is connected in series on the branch circuit provided with the filter capacitor, so that the resonance peak at the switching frequency of the filter is suppressed, the filter system is more stable in operation, the cost is low, and the structure is simple.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of a structural framework of an energy storage converter according to the present invention;
fig. 2 is a schematic structural diagram of the LCL type filter of the present invention;
fig. 3 is a schematic diagram of the framework of the optical storage system of the present invention.
Reference numerals are as follows: 1. an isolation transformer; 2. a filter; 21. a current-transforming side inductor; 22. a network side inductor; 23. a filter capacitor; 24. a damping resistor; 3. a power switching device; 4. a controller; 41. a processing center; 42. an alternating current detection module; 43. a direct current detection module; 44. a first signal conditioning circuit; 45. a second signal conditioning circuit; 5. a three-phase switch; 6. a three-phase circuit breaker; 7. a power grid; 71. a photovoltaic array; 72. a photovoltaic inverter; 73. a direct current bus; 74. a local load; 75. an energy storage battery; 8. a DC circuit breaker.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An energy storage converter and optical storage system as shown in fig. 1 to 3, comprising an isolation transformer 1, a filter 2, a power switch device 3 and a controller 4, wherein the isolation transformer 1 is connected with a power grid 7 through a three-phase switch 5 and connected with the filter 2 through a three-phase breaker 6, the power switch device 3 is connected with the filter 2 and connected with an energy storage battery 75 through a direct current breaker 8, and the controller 4 is connected with the power switch device 3; the controller 4 includes a processing center 41, an ac detection module 42 and a dc detection module 43, the ac detection module 42 collects voltage and current parameters of three-phase ac current and is connected to the processing center 41 through a first signal conditioning circuit 44, and the dc detection module 43 collects voltage and current parameters at the dc breaker 8 and is connected to the processing center 41 through a second signal conditioning circuit 45.
In the application, the energy storage converter adopts a PWM (pulse-width modulation) technology, realizes electric energy conversion by controlling a switching tube of a converter bridge, and filters out higher harmonics at a large amount of switching frequencies on the network side by matching with a filter 2, so that the quality of electric energy on the network side is improved; the isolation transformer 1 can protect the energy storage converter when the power grid 7 fails.
Compared with the conventional L-type filter 2, the LCL-type filter 2 is adopted in this embodiment, and includes a transforming side inductor 22, a grid side inductor 22, and a filter capacitor 23, the grid side inductor 22 is disposed close to the power grid 7, the transforming side inductor 21 is connected in series with the grid side inductor 22, and the filter capacitor 23 is connected in parallel between the transforming side inductor 21 and the grid side inductor 22. The added filter capacitor 23 branch can effectively attenuate high-frequency harmonic waves, reduce harmonic distortion rate of grid-connected current and improve electric energy quality.
Further, a damping resistor 24 is connected in series to the filter capacitor 23. The LCL type filter 2 has small inductance volume, light weight, high dynamic response speed of the system and low loss, but has a resonance peak. The damping resistor 24 is connected in series on the branch circuit provided with the filter capacitor 23, so that the resonance peak at the switching frequency of the filter 2 is suppressed, the operation of a filter system is more stable, the cost is low, and the structure is simple.
In this embodiment, the ac detection module 42 employs a hall sensor, and the hall sensor inputs the acquired voltage signal to the processing center 41 after passing through the low pass filter 2, the voltage follower, and the bias circuit in sequence. The voltage amplitude of the circuit of the power grid 7 is large, and the voltage amplitude needs to be changed into a small-amplitude signal through the Hall sensor so as to adapt to an A/D conversion module in the processing center 41, the small-amplitude signal acquired by the Hall sensor can be accompanied by a negative value or more high-order harmonic signals, and therefore the voltage signal is stably transmitted into an A/D channel of the processing center 41 within 0-3V by arranging the low-pass filter 2 and the voltage following and biasing circuit.
The AC/DC energy storage converter is used as a connecting bridge between the direct current side and the alternating current bus side of the energy storage system, current parameters of the alternating current side and the direct current side of the energy storage converter are respectively collected through the alternating current detection module 42 and the direct current detection module 43, power at each position and an adjusting current or voltage signal of the energy storage system are calculated through the processing center 41, power control is converted into current or voltage control, the processing center 41 is connected with the power switch device 3, and the switching mode of the power switch device 3 is controlled by modulating and outputting driving pulses through an SVPWM algorithm.
In the application, the light storage system comprises a photovoltaic array 71, a photovoltaic inverter 72, a direct current bus 73, a local load 74, an energy storage battery 75 and the energy storage converter, wherein the direct current bus 73 is connected with the direct current bus 73 through a grid-connected switch, the photovoltaic array 71 is connected with the direct current bus 73 through the photovoltaic inverter 72, the energy storage battery 75 is connected with the direct current bus 73 through the energy storage converter, and the local load 74 and the energy storage battery 75 are arranged in parallel.
In the grid-connected state, the energy storage converter works in a discharging mode or a charging mode according to the actual conditions, and is specifically judged according to the actual conditions of the output power of the photovoltaic array 71, the discharging power of the energy storage battery 75 and the consumed power of the local load 74, which are obtained through calculation.
When the sum of the output power of the photovoltaic array 71 and the discharge power of the energy storage battery 75 is smaller than the power of the local load 74, the light storage system needs to absorb electric energy from the power grid 7 to maintain the load power demand; when the power grid 7 normally operates and the photovoltaic array 71, the energy storage battery 75 and the local load 74 reach power internal balance, and no energy is absorbed or fed into the power grid 7, the energy storage converter can work in a discharging state and can also work in a charging state; specifically, when the photovoltaic array 71 generates electricity normally to meet the power consumption of the local load 74 and there is excess power, the energy storage battery 75 is charged; when the photovoltaic array 71 fails to meet the local load 74 power demand, the energy storage cell 75 discharges.
It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. An energy storage converter, comprising: the system comprises an isolation transformer (1), a filter (2), a power switch device (3) and a controller (4), wherein the isolation transformer (1) is connected with a power grid (7) through a three-phase switch (5) and is connected with the filter (2) through a three-phase breaker (6), the power switch device (3) is connected with the filter (2) and is connected with an energy storage battery (75) through a direct current breaker (8), and the controller (4) is connected with the power switch device (3);
the controller (4) comprises a processing center (41), an alternating current detection module (42) and a direct current detection module (43), wherein the alternating current detection module (42) collects voltage and current parameters of three-phase alternating current and is connected with the processing center (41) through a first signal conditioning circuit (44), and the direct current detection module (43) collects voltage and current parameters at a direct current breaker (8) and is connected with the processing center (41) through a second signal conditioning circuit (45).
2. The energy storage converter according to claim 1, wherein the filter (2) is an LCL type filter (2) and comprises a converter-side inductor (21), a grid-side inductor (22) and a filter capacitor (23), the grid-side inductor (22) is disposed close to the power grid (7), the converter-side inductor (21) is connected in series with the grid-side inductor (22), and the filter capacitor (23) is connected in parallel between the converter-side inductor (21) and the grid-side inductor (22).
3. Energy storage converter according to claim 2, characterized in that a damping resistor (24) is connected in series with said filter capacitor (23).
4. The energy storage converter according to claim 1, characterized in that the ac detection module (42) is a hall sensor, and the hall sensor inputs the collected voltage signal to the processing center (41) after passing through the low pass filter (2), the voltage follower and the bias circuit in sequence.
5. The energy storage converter according to claim 1, characterized in that said processing center (41) is connected to said power switching device (3) and controls said power switching device (3) to switch switching mode by modulating output driving pulses through SVPWM algorithm.
6. An optical storage system, which comprises a photovoltaic array (71), a photovoltaic inverter (72), a direct current bus (73), a local load (74), an energy storage battery (75) and the energy storage converter of any one of claims 1 to 5, wherein the direct current bus (73) is connected with the direct current bus (73) through a grid-connected switch, the photovoltaic array (71) is connected with the direct current bus (73) through the photovoltaic inverter (72), the energy storage battery (75) is connected with the direct current bus (73) through the energy storage converter, and the local load (74) and the energy storage battery (75) are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223257057.9U CN218678827U (en) | 2022-12-05 | 2022-12-05 | Energy storage converter and light storage system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202223257057.9U CN218678827U (en) | 2022-12-05 | 2022-12-05 | Energy storage converter and light storage system |
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| CN218678827U true CN218678827U (en) | 2023-03-21 |
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| CN202223257057.9U Active CN218678827U (en) | 2022-12-05 | 2022-12-05 | Energy storage converter and light storage system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505564A (en) * | 2023-04-03 | 2023-07-28 | 深圳市恩玖科技有限公司 | Control circuit of energy storage converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116505564A (en) * | 2023-04-03 | 2023-07-28 | 深圳市恩玖科技有限公司 | Control circuit of energy storage converter |
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