Energy storage system capable of realizing uninterruptible power supply of load

Abstract

The utility model discloses an energy storage system capable of realizing uninterruptible power supply of a load, comprising an energy storage battery system, a photovoltaic assembly, a bidirectional ACDC, an STS, a dual-power change-over switch ATS, a diesel generating set DG, a grid and a load, the energy storage battery system comprises a BATT and a PDU, the photovoltaic assembly comprises a PV and a DCDC, and the STS comprises an STS, a dual-power change-over switch ATS, a diesel generating set DG, a grid Grid and a load. The system can operate in an off-grid mode to supply power to the important load when the power grid is powered off, meanwhile, the ATS can complete switching to the standby power grid within seconds, the standby power grid supplies power to the system, and it is guaranteed that the important load is not powered off.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an energy storage system capable of realizing continuous power supply to a load. Background Art

[0002] When analyzing the energy storage process, the part of the object or space range delineated to determine the research object is called an energy storage system, which includes the input and output of energy and substances, and energy conversion and storage devices. The energy storage system often involves multiple types of energy, multiple devices, multiple substances, and multiple processes, and is a complex energy system that changes over time and requires multiple indicators to describe its performance. The energy storage system is an important part of the energy utilization system.

[0003] The existing energy storage systems have the following disadvantages when in use: The existing common energy storage systems mainly include common direct energy storage systems and energy storage systems with STS added. The former is mainly used in the peak-valley arbitrage mode, but it cannot supply power to the load when the power grid is disconnected. The latter is mainly used in the peak-valley arbitrage mode and off-grid power supply for important loads. Although it can supply power to important loads when the power grid is disconnected, when the power of the photovoltaic module is less than the load power, the energy storage battery power is required to supplement the load power, and the energy storage battery will gradually run out and cannot meet the power supply requirements of important loads for a long time. Therefore, we propose an energy storage system capable of realizing continuous power supply to a load. Summary of the Utility Model

[0004] The main purpose of the utility model is to provide an energy storage system capable of realizing continuous power supply to a load, which can operate off-grid to supply power to important loads when the power grid is powered off. At the same time, the ATS can complete the switching to the backup power grid within a few seconds, and the backup power grid supplies power to the system to ensure continuous power supply to important loads, effectively solving the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] An energy storage system capable of realizing continuous power supply to a load includes an energy storage battery system, and also includes a photovoltaic module, a bidirectional ACDC, an STS, a dual-power switching switch ATS, a diesel generator set DG, a power grid Grid, and a load. The energy storage battery system includes a BATT and a PDU. The photovoltaic module includes a PV and a DCDC. The photovoltaic module and the energy storage battery system are connected in parallel, and the current output end of the photovoltaic module is electrically connected to the current input end of the energy storage battery system. The output end of the diesel generator set DG is connected to the power grid Grid.

[0007] Furthermore, the output end of the diesel generator set DG is connected to the power grid Grid through the dual-power switching switch ATS; during emergency power supply, the dual-power switching switch ATS controls the diesel generator set to supply power to the power grid Grid.

[0008] Further, both the PV and BATT are connected to the load through a bidirectional ACDC and an STS; the photovoltaic modules and the energy storage battery system supply power to the load through the bidirectional ACDC and the STS.

[0009] Further, the grid Grid and the diesel generator set DG are connected to the load through a dual power switch ATS; the grid Grid and the diesel generator set DG can supply power to the load through the dual power switch ATS.

[0010] Compared with the prior art, the utility model has the following beneficial effects: after the grid is disconnected, the STS and the bidirectional ACDC switch to the off-grid mode of operation, and the photovoltaic modules and the energy storage battery system are connected in parallel to supply power to the load. When the output power of the photovoltaic modules is greater than the load power, the excess energy of the photovoltaic modules is charged to the energy storage battery system through the DCDC; when the output power of the photovoltaic modules is less than the load power, the missing energy of the photovoltaic modules is supplemented by the energy storage battery system. At the same time when the grid is disconnected, the diesel generator set DG starts, and the dual power switch ATS switches to the DG side of the diesel generator set. The diesel generator set DG is used as a backup power grid to supply power to the system. The STS and the bidirectional ACDC switch to the grid-connected mode of operation. After the grid is restored, the diesel generator set DG stops outputting, the STS and the bidirectional ACDC switch to the off-grid mode of operation, the dual power switch ATS switches to the grid side, and the grid supplies power to the system. The STS and the bidirectional ACDC switch to the grid-connected mode of operation. This solution can operate off-grid to supply power to important loads when the grid is powered off. At the same time, the dual power switch ATS can complete the switching to the backup power grid diesel generator side within a few seconds, and the backup power grid supplies power to the system to ensure that the important loads are continuously powered. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the operation of an existing direct energy storage system.

[0012] Figure 2 It is a schematic diagram of the operation of an existing energy storage system with an added STS.

[0013] Figure 3 It is a schematic diagram of the operation of an energy storage system of the utility model that can keep the load continuously powered. Detailed Embodiments

[0014] To make the technical means, creative features, achieved purposes and effects of the utility model easy to understand, the utility model will be further described below in conjunction with the specific embodiments.

[0015] Such as Figures 1-3As shown in the figure, an energy storage system capable of realizing continuous power supply to a load includes an energy storage battery system, and also includes a photovoltaic module, a bidirectional AC / DC, an STS, a dual power switch ATS, a diesel generator DG, a power grid Grid, and a load. The energy storage battery system includes a BATT and a PDU, and the photovoltaic module includes a PV and a DCDC. The photovoltaic module and the energy storage battery system are connected in parallel, and the current output end of the photovoltaic module is electrically connected to the current input end of the energy storage battery system. The output end of the diesel generator DG is connected to the power grid Grid.

[0016] Among them, the output end of the diesel generator DG is connected to the power grid Grid through the dual power switch ATS. The PV and the BATT are both connected to the load through the bidirectional AC / DC and the STS. During emergency power supply, the dual power switch ATS controls the diesel generator to supply power to the power grid Grid, and the photovoltaic module and the energy storage battery system supply power to the load through the bidirectional AC / DC and the STS.

[0017] Among them, the power grid Grid and the diesel generator DG are connected to the load through the dual power switch ATS. The power grid Grid and the diesel generator DG can supply power to the load through the dual power switch ATS.

[0018] It should be noted that the present utility model is an energy storage system capable of realizing continuous power supply to a load. During operation, after the power grid is disconnected, the STS and the bidirectional AC / DC switch to off-grid mode operation. The photovoltaic module and the energy storage battery system are connected in parallel to supply power to the load. When the output power of the photovoltaic module is greater than the load power, the excess energy of the photovoltaic module is charged to the energy storage battery system through the DCDC. When the output power of the photovoltaic module is less than the load power, the missing energy of the photovoltaic module is supplemented by the energy storage battery system. At the same time as the power grid is disconnected, the diesel generator DG starts, and the dual power switch ATS switches to the diesel generator DG side. The diesel generator DG is used as a backup power grid to supply power to the system. The STS and the bidirectional AC / DC switch to grid-connected mode operation. After the power grid is restored, the diesel generator DG stops outputting, the STS and the bidirectional AC / DC switch to off-grid mode operation, the dual power switch ATS switches to the power grid side, and the power grid supplies power to the system. The STS and the bidirectional AC / DC switch to grid-connected mode operation. This solution can operate off-grid to supply power to important loads when the power grid is out of power. At the same time, the dual power switch ATS can complete the switch to the backup power grid diesel generator side within a few seconds, and the backup power grid supplies power to the system to ensure that the important load is continuously powered.

[0019] The above has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. An energy storage system capable of realizing continuous power supply for the load, including an energy storage battery system, characterized in that, It also includes a photovoltaic module, a bidirectional AC / DC, an STS, a dual power transfer switch ATS, a diesel generator set DG, a power grid Grid, and a load. The energy storage battery system includes BATT and PDU, and the photovoltaic module includes PV and DCDC. The photovoltaic module and the energy storage battery system are connected in parallel, and the current output end of the photovoltaic module is electrically connected to the current input end of the energy storage battery system. The output end of the diesel generator set DG is connected to the power grid Grid.

2. The energy storage system capable of realizing continuous power supply to the load according to claim 1, wherein: The output end of the diesel generator set DG is connected to the power grid Grid through the dual power transfer switch ATS.

3. The energy storage system capable of realizing continuous power supply for the load according to claim 1, wherein: Both the PV and BATT are connected to the load through the bidirectional AC / DC and the STS.

4. A power storage system capable of realizing continuous power supply to a load according to claim 1, characterized in that: The power grid Grid and the diesel generator set DG are connected to the load through the dual power transfer switch ATS.

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