Photovoltaic energy storage power generation system

Abstract

The utility model discloses a photovoltaic energy storage power generation system, which relates to the technical field of photovoltaic power generation and comprises a photovoltaic cell array, a switch matrix, a miniature grid-connected inverter, a power grid, a charging and discharging controller, a first energy storage cell, a second energy storage cell, an off-grid inverter and a rated alternating current load. The photovoltaic cell array is connected with the switch matrix; the switch matrix is respectively connected with the micro grid-connected inverter and the charging and discharging controller; the micro grid-connected inverter is connected with a power grid; the charging and discharging controller is respectively connected with the first energy storage battery and the second energy storage battery; the first energy storage battery and the second energy storage battery are connected with the off-grid inverter; and the off-grid inverter is connected with a rated alternating current load. The power supply device is composed of a plurality of independent modules, each module is clear in function, modes can be switched according to different working states and requirements, power supply with the maximum efficiency is achieved, the daily power utilization requirement can be met, and basic power supply for families can be guaranteed under the condition that a power grid is powered off.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic power generation technical field, concretely relates to a photovoltaic energy storage power generation system. BACKGROUND

[0002] With the acceleration of urbanization process and the popularity of distributed energy technology, balcony photovoltaic power generation becomes a more and more popular energy solution. Using sunlight directly on the balcony area, directly converting solar energy into electrical energy, not only can reduce household power consumption, but also can contribute to the popularity of green energy. Micro-grid-connected inverters are widely used in balcony photovoltaic power generation systems due to their flexible installation, simple system and other advantages. Their main advantages also include:

[0003] Distributed power generation maximizes the use of available space. High efficiency, with single photovoltaic panel maximum power tracking function, even in weather changes (such as cloud cover), still can maintain high efficiency power generation. Convenience, small equipment volume, light weight, no professional personnel can quickly complete the installation, significantly reduce the initial deployment cost. Safety, DC input voltage is lower than 60V, in the safe voltage range, no additional isolation device is needed to ensure operation safety. No noise, passive heat dissipation design, no fan operation, effectively reduce noise pollution, especially suitable for residential areas. Weather resistance, IP67 waterproof and dustproof level, can be used in harsh outdoor environments for long-term stable operation, without increasing indoor cooling load.

[0004] However, the current balcony photovoltaic power generation system with micro-grid-connected inverter as the core generally lacks energy storage function, which cannot provide power support in power failure, in addition, the existing energy storage system on the market mainly faces large-scale application scenarios, such as commercial and industrial users, the system is complex, the cost is high and the capacity is too large, which does not match the miniaturization demand of balcony photovoltaic power generation system. These problems restrict the actual use efficiency of balcony photovoltaic power generation system in power failure scenarios. UTILITY MODEL CONTENTS

[0005] The utility model aims to provide a photovoltaic energy storage power generation system to solve the problems raised in the above background.

[0006] In order to achieve the above purpose, the utility model provides the following technical scheme: a photovoltaic energy storage power generation system, comprising:

[0007] Photovoltaic cell array, switch matrix, micro-grid-connected inverter, power grid, charge and discharge controller, first energy storage battery, second energy storage battery, off-grid inverter and rated AC load;

[0008] The photovoltaic cell array is connected with the switch matrix;

[0009] The switch matrix is connected with the micro-grid-connected inverter and the charge and discharge controller respectively;

[0010] The micro-grid-connected inverter is connected with the power grid.

[0011] The charge-discharge controller is connected with the first energy storage battery and the second energy storage battery respectively.

[0012] The first energy storage battery and the second energy storage battery are connected with the off-grid inverter.

[0013] The off-grid inverter is connected with the rated AC load.

[0014] Preferably, the photovoltaic cell array comprises at least two photovoltaic cell units, and a plurality of the photovoltaic cell units are connected in parallel to form the photovoltaic cell array, and a channel 1 for transmitting current is arranged between the photovoltaic cell array and the switch matrix.

[0015] Preferably, the switch matrix comprises a first switch and a second switch, a channel 2 for transmitting current is arranged between the first switch and the micro-grid-connected inverter, and a channel 3 for transmitting current is arranged between the second switch and the charge-discharge controller.

[0016] Preferably, a channel 4 for transmitting current is arranged between the micro-grid-connected inverter and the power grid.

[0017] Preferably, channels 5 and 6 for transmitting current are arranged between the charge-discharge controller and the first energy storage battery and the second energy storage battery respectively.

[0018] Preferably, channels 7 and 8 for transmitting current are arranged between the first energy storage battery and the second energy storage battery and the off-grid inverter respectively.

[0019] Preferably, a channel 9 for transmitting current is arranged between the off-grid inverter and the rated AC load.

[0020] Preferably, the charge-discharge controller comprises a charge controller circuit and a discharge controller circuit.

[0021] In the above technical solution, the technical effects and advantages provided by the utility model are as follows:

[0022] 1. When the micro-grid-connected inverter in the photovoltaic energy storage power generation system is switched to the grid-connected state by the matrix switch, the maximum power point of each photovoltaic panel can be independently tracked, high solar energy conversion rate can be provided when the weather changes, meanwhile, the micro-grid-connected inverter is directly coupled to the power grid, the size of the local load does not need to be considered, the output power can be maximized, and high economic benefits can be achieved.

[0023] 2、By setting first energy storage battery and second energy storage battery, meet different time dimension electricity demand, wherein, first energy storage battery is used for emergency lighting and low power consumption equipment power supply, second energy storage battery is used for longer time electricity guarantee;

[0024] 3、In this photovoltaic energy storage power generation system, modular design is adopted, each component is small in size and light in weight, easy to install, and suitable for balcony photovoltaic distributed arrangement;

[0025] 4、When the power grid is powered off, the matrix switch is switched to off-grid mode, and the local load is powered by the off-grid inverter, ensuring basic power demand of the family. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to make the skilled in the art better understand the technical scheme of the present application or prior art, the following will be briefly introduced the drawings needed to be used in the embodiments, obviously, the drawings described in the following are only some embodiments described in the present application, for those skilled in the art, other drawings can also be obtained according to these drawings.

[0027] Figure 1 It is the system overall structure schematic diagram of the utility model;

[0028] Figure 2 It is the photovoltaic cell array composition structure schematic diagram of the utility model;

[0029] Figure 3 It is the charge and discharge controller structure schematic diagram of the utility model;

[0030] Figure 4 It is the switch matrix structure schematic diagram of the utility model.

[0031] Mark explanation:

[0032] 10, rated AC load;20, photovoltaic cell array;30, switch matrix;31, first switch;32, second switch;40, micro grid-connected inverter;50, power grid;60, charge and discharge controller;61, charge controller circuit;62, discharge controller circuit;70, first energy storage battery;80, second energy storage battery;90, off-grid inverter. DETAILED DESCRIPTION

[0033] In order to make the skilled in the art better understand the technical scheme of the present application, the following will be further described in detail with reference to the drawings.

[0034] The utility model provides a photovoltaic energy storage power generation system as Figures 1 to 4 As shown in the figure, comprising:

[0035] The photovoltaic cell array 20, the switch matrix 30, the micro-grid-connected inverter 40, the power grid 50, the charge-discharge controller 60, the first energy storage battery 70, the second energy storage battery 80, the off-grid inverter 90 and the rated AC load 10;

[0036] The photovoltaic cell array 20 comprises at least two photovoltaic cell units, and a plurality of photovoltaic cell units are connected in parallel to form the photovoltaic cell array 20.

[0037] The photovoltaic cell array 20 is connected with the switch matrix 30, and a channel 1 for conveying current is arranged between the photovoltaic cell array 20 and the switch matrix 30.

[0038] The switch matrix 30 is connected with the micro-grid-connected inverter 40 and the charge-discharge controller 60 respectively.

[0039] The switch matrix 30 comprises a first switch 31 and a second switch 32, a channel 2 for conveying current is arranged between the first switch 31 and the micro-grid-connected inverter 40, and a channel 3 for conveying current is arranged between the second switch 32 and the charge-discharge controller 60.

[0040] The micro-grid-connected inverter 40 is connected with the power grid 50, and a channel 4 for conveying current is arranged between the micro-grid-connected inverter 40 and the power grid 50.

[0041] The charge-discharge controller 60 is connected with the first energy storage battery 70 and the second energy storage battery 80 respectively, and a channel 5 and a channel 6 for conveying current are arranged between the charge-discharge controller 60 and the first energy storage battery 70 and the second energy storage battery 80 respectively.

[0042] The first energy storage battery 70 and the second energy storage battery 80 are connected with the off-grid inverter 90, and a channel 7 and a channel 8 for conveying current are arranged between the first energy storage battery 70 and the second energy storage battery 80 and the off-grid inverter 90 respectively.

[0043] The off-grid inverter 90 is connected with the rated AC load 10, a channel 9 for conveying current is arranged between the off-grid inverter 90 and the rated AC load 10, and the charge-discharge controller 60 comprises a charge controller circuit 61 and a discharge controller circuit 62.

[0044] In the photovoltaic energy storage power generation system provided by the utility model,

[0045] The cables used for connection are all comprehensive cables composed of metal power conductors with external insulation and communication lines with external insulation;

[0046] The photovoltaic cell array 20 is composed of a plurality of photovoltaic cell units, converts sunlight into direct current through a photovoltaic effect, each cell can work independently, ensures that other cells can still operate normally when a single cell fails, and improves the reliability of the system.

[0047] The main function of the matrix switch 30 is to selectively switch the output path of the photovoltaic cell array 20 according to the power demand and system working mode. The matrix switch 30 has multiple working states, such as grid-connected mode, energy storage mode, off-grid mode, etc., to ensure that the system can efficiently and flexibly manage electric energy.

[0048] The main task of the micro grid-connected inverter 40 is to convert the direct current generated by the photovoltaic cell array into alternating current and feed it into the power grid. When the power grid condition is stable, the micro grid-connected inverter 40 continuously optimizes the conversion efficiency according to the maximum power point tracking, ensuring the best solar power generation effect.

[0049] The charge and discharge controller 60 is responsible for monitoring and managing the charging and discharging process of the energy storage battery. The charging controller circuit 61 controls the charging voltage and current to ensure that the battery is charged within a safe range. The discharging controller circuit 62 adjusts the voltage and current output of the battery discharge according to the household electricity demand to ensure stable and continuous power supply.

[0050] The first energy storage battery 70 and the second energy storage battery 80 respectively undertake different power supply tasks.

[0051] The first energy storage battery 70 provides short-term power guarantee, usually used for emergency lighting, low-power devices, etc.

[0052] The second energy storage battery 80 provides support for long-term power demand, such as power supply for household main equipment.

[0053] When the power grid fails or is powered off, the off-grid inverter 90 serves as the core of the off-grid mode and directly provides alternating current for local loads.

[0054] At this time, the system relies on the first energy storage battery 70 and the second energy storage battery 80 to provide power, and converts and stabilizes the current output through the off-grid inverter 90 to ensure basic household electricity demand. The rated AC load 10 is the core household electricity load of the system, including lighting, electrical appliances and information equipment, etc.

[0055] In the case of sufficient sunlight, the photovoltaic cell array 20 connects direct current to the matrix switch 30 through channel 1;

[0056] For example, Figure 3As shown, the matrix switch 30 includes two sets of switching units: a first switch 31 and a second switch 32. When the first switch 31 is closed, the system enters grid-connected mode; when the second switch 32 is closed, the system enters energy storage mode. The first switch 31 is normally closed, and the second switch 32 is normally open. When there is sufficient sunlight and the grid is normal, the first switch 31 of the matrix switch 30 transmits DC power to the micro grid-connected inverter 40 through channel 2. When the voltage and frequency of the grid 50 are normal, the micro grid-connected inverter 40 adjusts its operating state according to maximum power point tracking to ensure optimal energy conversion efficiency. The micro grid-connected inverter 40 transmits the converted AC power to the grid 50 through channel 4. The grid 50 does not need to consider load fluctuations, and the micro grid-connected inverter 40 ensures that it can stably output maximum power, improving economic efficiency. When the power generated by the photovoltaic array 20 exceeds the maximum power output of the micro grid-connected inverter 40, the second switch 32 in the matrix switch 30 closes, activating the energy storage mode. The additional power is transferred through channel 3 to the charge / discharge controller 60, further charging the first energy storage battery 70 and the second energy storage battery 80. The first energy storage battery 70 is primarily used to provide short-term power backup, such as for emergency lighting, while the second energy storage battery 80 is responsible for providing long-term power backup, such as for household appliances and information equipment. The charging process of the energy storage batteries is regulated by the charge / discharge controller 60 according to the battery status.

[0057] The charge / discharge controller 60 is connected to the first energy storage battery 70 and the second energy storage battery 80 through channels 5 and 6 respectively, manages their charging process, and monitors the battery temperature and status through the signal lines in the channels to ensure safe charging.

[0058] Power grid 50 outage response: When power grid 50 experiences a power outage, as follows... Figure 3 When the first switch 31 in the matrix switch 30 is opened, the system automatically switches to off-grid mode. The system no longer outputs power to the grid 50, but instead switches to a mode powered by the energy storage battery. At this time, the first energy storage battery 70 and the second energy storage battery 80 are output to the off-grid inverter 90 through channels 7 and 8 respectively. The off-grid inverter 90 provides AC power to the local AC load 10 through channel 9. The energy storage battery, through the off-grid inverter 90, provides a power guarantee for the household, ensuring the normal operation of basic household electrical equipment such as lighting and information devices.

[0059] During the charging and discharging process of the first energy storage battery 70 and the second energy storage battery 80, the charge / discharge controller 60 is responsible for managing the process. For example... Figure 4 As shown, the charge / discharge controller 60 includes a charge controller circuit 61 and a discharge controller circuit 62. The charge controller circuit 61 monitors key parameters of the energy storage battery, such as voltage and temperature, through sensors to ensure that the battery is charged within a safe range; the discharge controller circuit 62 manages the discharge strategy according to local load demand to ensure stable output.

[0060] Certain exemplary embodiments of the present application have been described above by way of illustration, and it is to be understood that certain modifications can be made without departing from the spirit and scope of the application. Therefore, the above description and illustrations should not be construed in a limiting sense as the scope of the present application should be limited only by the appended claims.

Claims

1. A photovoltaic energy storage power generation system, characterized by, The utility model relates to a photovoltaic power generation system, including: photovoltaic cell array (20), switch matrix (30), micro grid-connected inverter (40), power grid (50), charge and discharge controller (60), first energy storage battery (70), second energy storage battery (80), off-grid inverter (90) and rated AC load (10); The photovoltaic cell array (20) is connected with the switch matrix (30); The switch matrix (30) is connected with the micro grid-connected inverter (40) and the charge and discharge controller (60) respectively; The micro grid-connected inverter (40) is connected with the power grid (50); The charge and discharge controller (60) is connected with the first energy storage battery (70) and the second energy storage battery (80) respectively; The first energy storage battery (70) and the second energy storage battery (80) are connected with the off-grid inverter (90); The off-grid inverter (90) is connected with the rated AC load (10).

2. A photovoltaic energy storage power system according to claim 1, wherein: The photovoltaic cell array (20) includes at least two photovoltaic cell units, and a plurality of photovoltaic cell units are connected in parallel to form the photovoltaic cell array (20), and a channel 1 for conveying current is arranged between the photovoltaic cell array (20) and the switch matrix (30).

3. A photovoltaic energy storage power system according to claim 1, wherein: The switch matrix (30) includes a first switch (31) and a second switch (32), a channel 2 for conveying current is arranged between the first switch (31) and the micro grid-connected inverter (40), and a channel 3 for conveying current is arranged between the second switch (32) and the charge and discharge controller (60).

4. The photovoltaic energy storage power system of claim 1, wherein: A channel 4 for conveying current is arranged between the micro grid-connected inverter (40) and the power grid (50).

5. The photovoltaic energy storage power system of claim 1, wherein: Channels 5 and 6 for conveying current are arranged between the charge and discharge controller (60) and the first energy storage battery (70) and the second energy storage battery (80) respectively.

6. A photovoltaic energy storage power system according to claim 1, wherein: Channels 7 and 8 for conveying current are arranged between the first energy storage battery (70) and the second energy storage battery (80) and the off-grid inverter (90) respectively.

7. The photovoltaic energy storage power system of claim 1, wherein: A channel 9 for conveying current is arranged between the off-grid inverter (90) and the rated AC load (10).

8. The photovoltaic energy storage power system of claim 1, wherein: The charge and discharge controller (60) includes a charge controller circuit (61) and a discharge controller circuit (62).

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