CN211859618U - Novel VSG light-storage grid-connected power generation system - Google Patents
Novel VSG light-storage grid-connected power generation system Download PDFInfo
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- CN211859618U CN211859618U CN202020800399.2U CN202020800399U CN211859618U CN 211859618 U CN211859618 U CN 211859618U CN 202020800399 U CN202020800399 U CN 202020800399U CN 211859618 U CN211859618 U CN 211859618U
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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
Abstract
The utility model relates to a novel VSG light-storage grid-connected power generation system, including power supply thread (13), be equipped with photovoltaic panel (1), first direct current converter (2), dc-to-ac converter (3) and electric wire netting (4) that connect gradually on power supply thread (13), be equipped with second direct current converter (5) and first energy storage battery (6) between first direct current converter (2) and dc-to-ac converter (3), be equipped with two-way inverter (11) and second energy storage battery (12) between dc-to-ac converter (3) and electric wire netting (4), second energy storage battery (12) adopt virtual synchronous generator control strategy. Compared with the prior art, the utility model has the advantages of stabilize output power of leading light-storage system under the transient state condition, effectively adjust the fluctuation of system voltage and frequency, improve the stability of electric energy supply.
Description
Technical Field
The utility model belongs to the technical field of electric power system control technique and specifically relates to a novel VSG light-storage grid-connected power generation system is related to.
Background
The traditional VSG photovoltaic grid-connected power generation system with the energy storage system is shown in figure 1, the energy storage system is additionally arranged on the basis of a two-stage photovoltaic grid-connected power generation system, the energy storage system is composed of an energy storage device, a DC/DC converter and an energy management system, and the stabilizing of the photovoltaic output power fluctuation is realized through the energy storage system. However, the conventional optical-storage grid-connected power generation system based on the virtual synchronous generator technology still has the following problems in the realization of the functions:
1) the photovoltaic output has volatility and randomness, so that the frequency of a power grid system fluctuates, and the integral output characteristic of light-storage is regulated and controlled by a uniform inverter, so that the control difficulty is increased, and the system stability is reduced;
2) in a traditional light-storage grid-connected power generation system, aiming at the requirement change of a grid side load, a photovoltaic array needs to adjust output force in time to maintain the stability of system frequency and voltage, and the output cannot be continuously output at the maximum power;
3) although the traditional VSG optical-storage control system can effectively solve the problem of frequency sudden change caused by small load fluctuation on the power grid side, due to the limitation of energy storage, the system is not sufficient for power fluctuation of a high-power device on the power grid side, and cannot timely and effectively provide enough power for replenishment.
The chinese patent No. cn201810865099.x discloses a grid-connected power generation system with complementary light-storage, which includes a grid-connected photovoltaic stage and an energy storage stage combined to a power grid for power supply, wherein the energy storage stage includes an energy storage module, an energy storage level DC-DC converter and an energy storage inverter, and the above-mentioned problems of large fluctuation, inability to continuously output at maximum power, and inability to provide sufficient power supply exist in the process of supplying power to the power grid.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a novel VSG light-storage grid-connected power generation system for overcoming the defects of great volatility and low photovoltaic output efficiency in the prior art.
The purpose of the utility model can be realized through the following technical scheme:
the utility model provides a novel VSG light-storage grid-connected power generation system, includes the power supply thread, be equipped with photovoltaic panel, first DC converter, dc-to-ac converter and the electric wire netting that connects gradually on the power supply thread, be equipped with second DC converter and first energy storage battery between first DC converter and the dc-to-ac converter, be equipped with two-way inverter and second energy storage battery between dc-to-ac converter and the electric wire netting, second energy storage battery adopts virtual synchronous generator control strategy.
And the second energy storage battery is connected with the power supply main line through the bidirectional inverter.
Furthermore, a load group is arranged between the connection point of the bidirectional inverter and the power supply main line and the power grid.
Further, the load group comprises a first load, a second load and a third load which are sequentially connected with the power supply main line.
Furthermore, 3 paths are arranged between the inverter and the power grid, and the first load, the second load and the third load are all connected with the 3 paths.
Further, a switch group is arranged between the load group and the power grid.
Further, the number of switches in the switch group is 3, and the switches are respectively arranged on 3 paths.
The first energy storage battery is connected with the power supply main line through the second direct current converter.
The first energy storage battery has a Maximum Power Point Tracking (MPPT) function, and the maximum power output of the photovoltaic array is realized through the MPPT.
The first energy storage battery and the second energy storage battery are all vanadium redox flow batteries.
Compared with the prior art, the utility model discloses following beneficial effect has:
1. the utility model discloses set up two-way inverter and second energy storage battery between dc-to-ac converter and electric wire netting, can stabilize leading light-the output that stores up the system under the transient state condition, can adjust the fluctuation of the system voltage that causes by the sudden change of net side high-power device load effectively again and frequency, improve the stability of electric energy supply.
2. The utility model discloses well first direct current converter carries out direct current-direct current with the electric energy that photovoltaic electroplax gathered and changes, promotes photovoltaic array output voltage to realize photovoltaic array maximum power output through maximum power tracking control.
3. The utility model discloses first energy storage battery and second energy storage battery are the full vanadium redox flow battery who possesses high-power, large capacity, long-life advantage, enable energy storage system to have great inertia.
Drawings
Fig. 1 is a schematic structural diagram of a conventional VSG grid-connected photovoltaic power generation system;
fig. 2 is a schematic structural diagram of the present invention.
Reference numerals:
1-photovoltaic panel; 2-a first dc converter; 3-an inverter; 4-a power grid; 5-a second dc converter; 6-
A first energy storage battery; 7-a first load; 8-a second load; 9-a third load; 10-a switch group; 11-a bidirectional inverter; 12-a second energy storage battery; 13-power supply main line.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 2, a novel VSG optical-storage grid-connected power generation system improves the stability of power supply, and includes a power supply main line 13, a photovoltaic panel 1, a first dc converter 2, an inverter 3 and a power grid 4 which are connected in sequence are arranged on the power supply main line 13, a second dc converter 5 and a first energy storage battery 6 are arranged between the first dc converter 2 and the inverter 3, a bidirectional inverter 11 and a second energy storage battery 12 are arranged between the inverter 3 and the power grid 4, and the second energy storage battery 12 adopts a virtual synchronous generator control strategy.
The second energy storage battery 12 is connected to the power supply main line 13 via the bidirectional inverter 11.
A load group is provided between the connection point of the bidirectional inverter 11 and the power supply main line 13 and the grid 4.
The load group comprises a first load 7, a second load 8 and a third load 9, which are connected in turn to a power supply mains 13.
3 paths are arranged between the inverter 3 and the power grid 4, and the first load 7, the second load 8 and the third load 9 are all connected with the 3 paths.
A switch group 10 is arranged between the load group and the power grid 4.
The number of switches in the switch group 10 is 3, and the switches are respectively arranged on 3 paths.
The first energy storage battery 6 is connected to the power supply main line 13 via the second dc converter 5.
The first energy storage battery 6 has a Maximum Power Point Tracking (MPPT) function, and realizes maximum power output of the photovoltaic array through MPPT.
The first energy storage battery 6 and the second energy storage battery 12 are all vanadium redox flow batteries.
Example one
The first direct current converter 2 carries out direct current-direct current change on the electric energy collected by the photovoltaic panel, improves the output voltage of the photovoltaic array, and realizes the maximum power output of the photovoltaic array through maximum power point tracking control (MPPT); the first energy storage battery 6 is connected with a power supply main line 13 through a bidirectional second direct current converter 5, and balances the photovoltaic output and the power required by the network side; the inverter 3 performs dc-ac conversion to ensure real-time output of the required power under the steady-state condition of the network side. The front-mounted light-storage system integrally realizes that the photovoltaic module always outputs the maximum power on the basis of ensuring the output required power, and improves the working efficiency of the photovoltaic module.
The second energy storage battery 12 is connected with the power supply main line 13 through the bidirectional inverter 11, and adopts a virtual synchronous generator control strategy to stabilize the output power of the preposed light-storage system under the transient condition and effectively adjust the system voltage and frequency fluctuation caused by the sudden change of the load of the high-power device on the network side.
In addition, it should be noted that the shapes of the components, the names of the components, and the like of the specific embodiments described in the present specification may be different, and the above description is only an example of the structure of the present invention. All minor or simple changes made according to the structure, characteristics and principles of the present invention are included in the protection scope of the present invention. Various modifications or additions may be made to the described embodiments or similar methods may be adopted by those skilled in the art without departing from the scope of the invention as defined in the claims.
Claims (10)
1. The utility model provides a novel VSG light-storage grid-connected power generation system, includes power supply thread (13), its characterized in that, be equipped with photovoltaic panel (1), first direct current converter (2), inverter (3) and electric wire netting (4) that connect gradually on power supply thread (13), be equipped with second direct current converter (5) and first energy storage battery (6) between first direct current converter (2) and inverter (3), be equipped with two-way inverter (11) and second energy storage battery (12) between inverter (3) and electric wire netting (4), second energy storage battery (12) adopt virtual synchronous generator control strategy.
2. The VSG photovoltaic-storage grid-connected power generation system according to claim 1, wherein the second energy storage battery (12) is connected to the power supply main line (13) through a bidirectional inverter (11).
3. The VSG grid-connected photovoltaic-storage power generation system according to claim 2, wherein a load group is provided between the connection point of the bidirectional inverter (11) and the power supply main line (13) and the power grid (4).
4. The VSG grid-connected photovoltaic-storage power generation system according to claim 3, wherein the load group comprises a first load (7), a second load (8) and a third load (9) which are sequentially connected with a power supply main line (13).
5. The VSG grid-connected photovoltaic-storage power generation system according to claim 4, wherein 3 paths are provided between the inverter (3) and the grid (4), and the first load (7), the second load (8) and the third load (9) are all connected with the 3 paths.
6. The VSG grid-connected photovoltaic-storage power generation system according to claim 5, wherein a switch group (10) is provided between the load group and the power grid (4).
7. The VSG grid-connected optical-storage power generation system according to claim 6, wherein the number of switches in the switch group (10) is 3.
8. The VSG grid-connected optical-storage power generation system according to claim 7, wherein the 3 switches are respectively arranged on 3 paths.
9. The VSG photovoltaic-storage grid-connected power generation system according to claim 1, wherein the first energy storage battery (6) is connected to the power supply main line (13) through a second DC converter (5).
10. The VSG photovoltaic-storage grid-connected power generation system according to claim 1, wherein the first energy storage battery (6) and the second energy storage battery (12) are all vanadium redox flow batteries.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114024337A (en) * | 2021-11-25 | 2022-02-08 | 国网上海市电力公司 | VSG light-storage grid-connected power generation system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114024337A (en) * | 2021-11-25 | 2022-02-08 | 国网上海市电力公司 | VSG light-storage grid-connected power generation system |
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