Energy supply module for prolonging standby time of off-grid photovoltaic energy storage system

Abstract

The utility model relates to the technical field of power electronics, in particular to an energy supply module for prolonging the standby time of an off-grid photovoltaic energy storage system, which comprises a self-adaptive energy storage current stabilization module, a photovoltaic power generation system, a lead-acid battery and an uninterruptible power supply. According to the utility model, the DC-DC conversion module and the anti-reverse diode are integrated at the storage battery interface of the UPS system, and the electric energy from the energy storage system with a higher voltage level is efficiently converted into a lower voltage suitable for charging the UPS storage battery, so that a safe and stable energy transmission and supply process is realized. Meanwhile, a station auxiliary electricity utilization photovoltaic power generation system is added, the system is directly connected with a storage battery charging loop of the UPS in a butt joint mode, renewable solar energy resources are utilized, green energy is efficiently supplemented for a storage battery, the overall energy structure is optimized, and sustainable operation is promoted. Through the two modes of charging the UPS storage battery, the purpose of prolonging the overall standby time of the energy storage system under the condition that the energy storage system is standby or the power grid is powered off is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric power especially relates to the energy supply module of prolonging standby time length of off -grid photovoltaic energy storage system. BACKGROUND

[0002] In the current energy field, with the growing global demand for renewable energy, off-grid photovoltaic energy storage systems as independent power supply solutions are increasingly widely used in remote areas, no grid access areas and unstable grid areas. Especially under the promotion of the "Belt and Road" initiative, micro-grid energy storage systems and large-scale photovoltaic energy storage projects are accelerating deployment in many developing countries in Asia, Africa, Latin America and the Middle East. Due to the large difference in basic power distribution facilities and uneven power quality in these regions, there is an urgent need for energy storage systems independent of the public grid.

[0003] However, the existing off-grid photovoltaic energy storage system faces a significant challenge: when the grid is powered off or the power conditioning system (PCS) of the system itself is in standby state, the standby time provided for critical loads such as uninterruptible power supply (UPS) is often limited. This is mainly due to the capacity and charge-discharge efficiency of the energy storage system (especially the battery pack), which limits the UPS from maintaining system operation for a long time in conditions of insufficient light such as continuous rainy days or night, affecting the reliability of continuous operation of the energy storage system and the power experience of users.

[0004] To solve this problem, the prior art attempts to optimize battery management strategies, improve battery performance, and use hybrid energy systems to extend the energy storage time, but in actual application, although the hybrid energy system can improve energy utilization efficiency and stability, how different energies work efficiently together and how to maximize the use of renewable energy while ensuring system stability is still a complex problem. INVENTION CONTENTS

[0005] The utility model increases the energy storage system and photovoltaic charging mode for UPS battery, achieves the purpose of prolonging the overall standby time of the energy storage system under the condition of energy storage system standby or grid power off.

[0006] The utility model provides the following technical scheme, the energy supply module of prolonging standby time length of off -grid photovoltaic energy storage system, including self -adaptation energy storage steady flow module, photovoltaic power generation system, lead -acid battery and uninterrupted power supply, wherein:

[0007] The self-adaptive energy storage steady flow module includes DC-DC module and anti-reverse diode D1, the DC-DC module input negative pole is connected with the negative pole of energy storage system DC power supply, the DC-DC module input positive pole is connected with the fuse, and the other end of the fuse is connected with the positive pole of energy storage system DC power supply;

[0008] The DC-DC module output negative pole is connected with the negative pole of the uninterruptible power supply and the negative pole of the lead-acid battery, the DC-DC module output positive pole is connected with the anode of the anti-reverse diode D1, and the cathode of the anti-reverse diode D1 is connected with the positive pole of the lead-acid battery.

[0009] As a further improvement of the technical solution, the photovoltaic power generation system comprises a photovoltaic module and an MPPT controller, the negative pole of the input end of the MPPT controller is connected with the negative pole of the photovoltaic module, and the positive pole of the input end of the MPPT controller is connected with the positive pole of the photovoltaic module.

[0010] The negative pole of the output end of the MPPT controller is connected with the negative pole of the uninterruptible power supply and the negative pole of the lead-acid battery, the positive pole of the output end of the MPPT controller is connected with the anode of the anti-reverse diode D2, and the cathode of the anti-reverse diode D2 is connected with the positive pole of the lead-acid battery.

[0011] As a further improvement of the technical solution, the negative pole of the DC output end of the uninterruptible power supply is connected with the negative pole of the lead-acid battery and the negative pole of the energy storage system DC power supply, and the positive pole of the DC output end of the uninterruptible power supply is connected with the positive pole of the lead-acid battery.

[0012] As a further improvement of the technical solution, the negative pole of the lead-acid battery is connected with the negative pole of the DC output end of the uninterruptible power supply, the negative pole of the output end of the MPPT controller and the negative pole of the energy storage system DC power supply, and the positive pole of the lead-acid battery is connected with the positive pole of the DC output end of the uninterruptible power supply, the anti-reverse diode D1 and the anti-reverse diode D2.

[0013] As a further improvement of the technical solution, the 220V input end of the uninterruptible power supply is connected with the AC power distribution cabinet through the zero line and the live line, and the 220V output end of the uninterruptible power supply is connected with the power conditioning system through the zero line and the live line.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] 1、In the battery interface of the uninterruptible power supply, a DC-DC conversion module and an anti-reverse diode are additionally arranged, so that the high-voltage electric energy from the energy storage system can be efficiently and safely converted into low-voltage electric energy suitable for the UPS battery, precise energy supply is realized, and the charging process is smooth and efficient.

[0016] 2、An additional photovoltaic power generation line is arranged and directly connected with the battery charging circuit of the uninterruptible power supply, the system uses solar energy as a clean and renewable resource to efficiently supplement green energy for the battery under sufficient sunlight, optimizes the energy structure, and promotes long-term sustainable operation of the system.

[0017] 3、When the power conditioning system (PCS) is in a non-working state or the power grid is normally powered, the UPS itself has the ability to charge the battery, so that the electric quantity can be supplemented in time under favorable conditions.

[0018] To ensure that each charging path does not interfere with each other and safe operation, both external power output end is equipped with anti-reverse diode, this detail design effectively isolates the potential conflict between different power supply, to ensure the stability and compatibility of the entire energy supply module. The patent implementation is simple, efficient use of renewable energy, improve the overall energy utilization, through the optimization of charging strategy and protection measures, improve the overall energy utilization. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The circuit schematic diagram of the utility model. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0021] To explain the technical content, construction features, purposes and effects of the present application in detail, the following will be described in detail in conjunction with the embodiments and the drawings.

[0022] Please refer to Figure 1 The utility model provides an embodiment:

[0023] An energy supply module for prolonging standby time of off-grid photovoltaic energy storage system, comprising self-adaptive energy storage current stabilizing module, photovoltaic power generation system, lead-acid battery and uninterruptible power supply (UPS), wherein:

[0024] The self-adaptive energy storage current stabilizing module comprises a DC-DC module and an anti-reverse diode D1, the negative electrode of the input end of the DC-DC module is connected with the negative electrode of the energy storage system DC power supply, the positive electrode of the input end of the DC-DC module is connected with a fuse, the other end of the fuse is connected with the positive electrode of the energy storage system DC power supply, the negative electrode of the output end of the DC-DC module is connected with the negative electrode of the lead-acid battery and the negative electrode of the UPS, the positive electrode of the output end of the DC-DC module is connected with the anode of the anti-reverse diode D1, and the cathode of the anti-reverse diode D1 is connected with the positive electrode of the lead-acid battery. The module integrates a DC-DC conversion module and an anti-reverse diode D1. One end of the DC-DC conversion module is connected with the DC power supply of the energy storage system and is protected by a fuse, and the other end is connected with the storage battery of the UPS and the lead-acid battery. The conversion module is responsible for reducing the higher voltage output by the energy storage system to a level suitable for charging the UPS battery, and the anti-reverse diode D1 ensures that the current can only flow in one direction, avoiding reverse current damage to the battery.

[0025] The photovoltaic power generation system comprises a photovoltaic assembly and an MPPT controller. The negative pole of the input end of the MPPT controller is connected to the negative pole of the photovoltaic assembly, the positive pole of the input end of the MPPT controller is connected to the positive pole of the photovoltaic assembly, the negative pole of the output end of the MPPT controller is connected to the negative pole of the lead-acid battery and the negative pole of the energy storage system, and the positive pole of the output end of the MPPT controller is connected to the anode of the anti-reverse diode D2, and the cathode of the anti-reverse diode D2 is connected to the positive pole of the lead-acid battery. The photovoltaic assembly and the maximum power point tracking (MPPT) controller are contained, which are used for capturing solar energy and efficiently converting the solar energy into electric energy. The MPPT controller is also connected to the battery of the UPS through the anti-reverse diode D2, so that the lead-acid battery can be directly charged when the light is sufficient, and the renewable energy can be fully utilized.

[0026] The negative pole of the DC output end of the uninterruptible power supply is connected to the negative pole of the lead-acid battery and the negative pole of the direct-current power supply of the energy storage system, and the positive pole of the DC output end of the uninterruptible power supply is connected to the positive pole of the lead-acid battery. In addition to charging the battery when the power grid is powered or the PCS is working, the DC output end of the UPS is also connected to the negative poles of the lead-acid battery and the direct-current power supply of the energy storage system, so that the charging process of the battery can also be participated in when necessary.

[0027] The negative pole of the lead-acid battery is connected to the negative pole of the DC output end of the uninterruptible power supply, the negative pole of the output end of the MPPT controller and the negative pole of the direct-current power supply of the energy storage system, and the positive pole of the lead-acid battery is connected to the DC output end of the uninterruptible power supply, the anti-reverse diode D1 and the anti-reverse diode D2. As the core of energy storage, the negative pole of the lead-acid battery is connected to the DC output end of the UPS, the output end of the MPPT controller and the negative pole of the direct-current power supply of the energy storage system, and the positive pole of the lead-acid battery is connected to the output of the self-adaptive energy storage and current stabilizing module and the output of the photovoltaic power generation system through the anti-reverse diode D1 and the anti-reverse diode D2. At the same time, the positive pole of the lead-acid battery is also directly connected to the positive pole of the uninterruptible power supply. When the power grid is powered off and the external power supply appears a problem, the lead-acid battery directly supplies power to the uninterruptible power supply.

[0028] The 220V input end of the uninterruptible power supply is connected to the AC power distribution cabinet through the zero line and the live line, and the 220V output end of the uninterruptible power supply is connected to the power regulation system through the zero line and the live line. The AC input and output of the UPS are connected to the power distribution cabinet and the power regulation system through the zero line and the live line respectively, so that the UPS can be normally used when the power grid is not powered off or the PCS is in a normal state.

[0029] It is apparent for a person skilled in the art that the present application is not restricted to the details of the above exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary only, and not limiting, the scope of the present application being defined by the appended claims rather than the above description, and all changes coming within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. An energy supply module for extending the standby duration of an off-grid photovoltaic energy storage system, characterized in that, Including self-adaptive energy storage current stabilizing module, photovoltaic power generation system, lead-acid battery and uninterruptible power supply, wherein: The self-adaptive energy storage current stabilizing module includes DC-DC module and anti-reverse diode D1, the negative electrode of the input end of the DC-DC module is connected with the negative electrode of the energy storage system DC power supply, the positive electrode of the input end of the DC-DC module is connected with the fuse, the other end of the fuse is connected with the positive electrode of the energy storage system DC power supply; The negative electrode of the output end of the DC-DC module is connected with the negative electrode of the uninterruptible power supply and the negative electrode of the lead-acid battery, the positive electrode of the output end of the DC-DC module is connected with the anode of the anti-reverse diode D1, the cathode of the anti-reverse diode D1 is connected with the positive electrode of the lead-acid battery; The negative electrode of the DC output end of the uninterruptible power supply is connected with the negative electrode of the lead-acid battery and the negative electrode of the energy storage system DC power supply, the positive electrode of the DC output end of the uninterruptible power supply is connected with the positive electrode of the lead-acid battery.

2. The energy supply module for prolonging standby time of off-grid photovoltaic energy storage system according to claim 1, characterized in that: The photovoltaic power generation system includes photovoltaic assembly and MPPT controller, the negative electrode of the input end of the MPPT controller is connected with the negative electrode of the photovoltaic assembly, the positive electrode of the input end of the MPPT controller is connected with the positive electrode of the photovoltaic assembly; The negative electrode of the output end of the MPPT controller is connected with the negative electrode of the uninterruptible power supply and the negative electrode of the lead-acid battery, the positive electrode of the output end of the MPPT controller is connected with the anode of the anti-reverse diode D2, the cathode of the anti-reverse diode D2 is connected with the positive electrode of the lead-acid battery.

3. The energy supply module for prolonging standby time of off-grid photovoltaic energy storage system according to claim 1, characterized in that: The negative electrode of the lead-acid battery is connected with the negative electrode of the DC output end of the uninterruptible power supply, the negative electrode of the output end of the MPPT controller and the negative electrode of the energy storage system DC power supply, the positive electrode of the lead-acid battery is connected with the positive electrode of the DC output end of the uninterruptible power supply, the anti-reverse diode D1 and the anti-reverse diode D2.

4. The energy supply module for prolonging standby time of off-grid photovoltaic energy storage system according to claim 1, characterized in that: The 220V input end of the uninterruptible power supply is connected with the AC power distribution cabinet through the zero line and the live wire, the 220V output end of the uninterruptible power supply is connected with the power regulation system through the zero line and the live wire.

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