Optical diesel storage grid-connected and off-grid device

Abstract

The utility model discloses a photovoltaic diesel storage grid-connected and off-grid device, which comprises a photovoltaic base station, a diesel power station and an energy storage power station, a photovoltaic panel in the photovoltaic base station is divided into a plurality of photovoltaic units, each photovoltaic unit is connected to a shunt circuit, two output ports on the shunt circuit are respectively provided with a first DC / DC converter and a second DC / DC converter, and the first DC / DC converter and the second DC / DC converter are connected with the energy storage power station. The output end of the first DC / DC converter is connected to a first transfer charging circuit, electric energy generated by the diesel power station is transformed through a transformer, the transformer is provided with two output ends, one output end directly supplies power to a load, the other output end is connected to the input end of a rectifier, and the output end of the rectifier is connected with a second transfer charging circuit. The first switching charging circuit and the second switching charging circuit are connected to the selective charging unit. According to the utility model, the shunting circuit can distribute electric energy required by a load to supply power according to the load requirement, redundant shunting is supplied to the energy storage power station, photovoltaic power generation is fully utilized, and the shunting circuit plays a leading role in diesel power generation at night.

Description

TECHNICAL FIELD

[0001] The utility model relates to a variety of power supply joint technical field especially, relates to a kind of light diesel storage and off-grid device. BACKGROUND

[0002] With the price of photovoltaic module, energy storage battery, inverter and other photovoltaic power generation equipment, the cost of photovoltaic power generation system decreases year by year.In some areas rich in solar energy resources, photovoltaic power generation is often used to maintain the power supply of production, operation and living facilities.Now the price of diesel is relatively cheap, and the power is also large, although the flue gas is a little larger after combustion, but it is also very feasible to establish a diesel power station to generate electricity in places where people gather little.But there is no better circuit structure for combining photovoltaic power generation and diesel power supply and storing excess energy in the power station, and the off-grid operation cannot be effectively realized. SUMMARY

[0003] The utility model aims at at least one of the technical problems in the related art to some extent.For this purpose, one object of the utility model is to provide a light diesel storage and off-grid device, which solves the problems of difficult comprehensive utilization of photovoltaic power generation and diesel power generation, and inability to generate power according to the needs of load.

[0004] According to the light diesel storage and off-grid device provided by the utility model, the photovoltaic panel in the photovoltaic base station is divided into multiple photovoltaic units, each of which is connected to a shunt circuit, two output ports are provided on the shunt circuit, and a first DC / DC converter and a second DC / DC converter are respectively provided on each output port, the output end of the first DC / DC converter is connected to a first switching charging circuit, the output end of the second DC / DC converter supplies power to the load, the electrical energy generated by the diesel power station is transformed by a transformer, the transformer has two output ends, one of which directly supplies power to the load, and the other output end is connected to the input end of a rectifier, the output end of the rectifier is connected to a second switching charging circuit, the first switching charging circuit and the second switching charging circuit are connected to a selection charging unit, multiple charging interfaces are provided on the selection charging unit, each charging interface corresponds to a block of energy storage battery in the energy storage station for charging, the energy storage station supplies power to the load, and the entire light diesel storage and off-grid device is controlled by a control system.

[0005] In some embodiments of the utility model, the shunt circuit includes a multi-way switching access circuit and a two-way output circuit, the output end of each photovoltaic unit is connected to a switching access circuit, the output end of the switching access circuit is a two-way branching circuit, and an electrically controlled switch is provided on the branching circuit, and the two branching circuits are respectively connected to the two-way output circuit.

[0006] In some other embodiments of this utility model, the first transfer charging circuit and the second transfer charging circuit are the same. The first transfer charging circuit includes a set of main transmission lines and multiple sets of branch transmission lines branching off from the main transmission lines.

[0007] In some other embodiments of this utility model, the selected charging unit is an adapter, which has two input terminals and one output terminal. The branch transmission lines of the first and second adapter charging circuits are respectively connected to one output terminal of the adapter, and the output terminal of the adapter is a charging interface.

[0008] In some other embodiments of this utility model, each energy storage battery in the energy storage power station is equipped with a power monitoring device, and the control system of the entire photovoltaic-diesel-storage-off-grid device is electrically connected to each power monitoring device.

[0009] In some other embodiments of this utility model, when the energy storage power station supplies power to the load, it first supplies power from the energy storage battery with the largest capacity, and when the capacity is less than 20%, it switches to other energy storage batteries to supply power.

[0010] In this invention, the shunt circuit can supply enough electrical energy to the load according to the load's needs, and the excess is shunt to the energy storage station to make full use of photovoltaic power generation. At night, the diesel generator plays a dominant role. If the energy storage station has sufficient power, it can be started to supply power to the load. If the power in the energy storage station is low at night, the diesel generator is started to shunt some electrical energy to charge the load, thereby realizing the effective use of photovoltaic power generation and diesel generator. Attached Figure Description

[0011] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0012] Fig. 1 This is a schematic diagram of the overall circuit of a photovoltaic-diesel storage and off-grid device proposed in this utility model.

[0013] Fig. 2 This is a schematic diagram of the shunt circuit principle proposed in this utility model.

[0014] Fig. 3 This is a schematic diagram of the first and second transfer charging circuits proposed in this utility model. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0017] Reference Figs. 1-3 A photovoltaic-diesel-storage-parallel off-grid device includes a photovoltaic base station, a diesel generator, and an energy storage station. The photovoltaic panels in the photovoltaic base station are divided into multiple photovoltaic units, each connected to a shunt circuit. The shunt circuit has two output ports, each equipped with a first DC / DC converter and a second DC / DC converter. The output of the first DC / DC converter is connected to a first transfer charging circuit, and the output of the second DC / DC converter supplies power to the load. The electricity generated by the diesel generator is transformed by a transformer, which has two output ports, one directly supplying power to the load and the other connected to the input of a rectifier. The output of the rectifier is connected to a second transfer charging circuit. Both the first and second transfer charging circuits are connected to a selective charging unit, which has multiple charging interfaces. Each charging interface corresponds to charging a battery block in the energy storage station. The energy storage station supplies power to the load. The entire photovoltaic-diesel-storage-parallel off-grid device is controlled by a control system.

[0018] During the day, the main power generation is photovoltaic power. When the sunlight is strong and the load power consumption is not high, sufficient power is provided from the output of the second DC / DC converter (a variable rectifier can also be set in the second DC / DC converter if the load requires AC power). The excess power is used to charge the energy storage station through the first DC / DC converter.

[0019] When there is insufficient sunlight during the day and the energy storage station is also insufficient, the diesel generator can start generating electricity during the day to supplement the insufficient photovoltaic power generation, or the photovoltaic can directly charge the energy storage station, and the diesel generator can directly supply power to the load.

[0020] At night, the energy storage power station prioritizes power supply; if the power supply is insufficient, the diesel generator station continues to supply power.

[0021] The shunt circuit includes a multi-channel switching access circuit and two output circuits. The output terminal of each photovoltaic unit is connected to a switching access circuit. The output terminal of the switching access circuit is a two-way branch circuit and an electronically controlled switch is provided on the branch circuit. The two branch circuits are respectively connected to the two output circuits.

[0022] Based on power supply requirements, the control system controls the electronic control switch to switch the input circuit to which output circuit it connects to, whether it is for charging or powering the load.

[0023] like Fig. 3 The first and second transfer charging circuits are identical. The first transfer charging circuit includes a main power line and multiple branch power lines branching off from the main power line.

[0024] The selective charging unit comprises multiple adapters, each with two input terminals and one output terminal. Branch transmission lines from the first and second adapter charging circuits are respectively connected to one output terminal of the adapter. The output terminal of the adapter serves as a charging interface. The adapter has two input lines connected in parallel to achieve a single output terminal.

[0025] Each energy storage battery in the energy storage power station is equipped with a power monitoring device, and the control system of the entire photovoltaic-diesel-storage-off-grid system is electrically connected to each power monitoring device. The control system monitors the power in real time to determine whether to use the energy storage power station for power supply (when photovoltaic power is insufficient).

[0026] The energy storage power station supplies power to the load by first supplying power to the energy storage battery with the largest capacity. When the capacity drops below 20%, it switches to other energy storage batteries. The principle of prioritizing the battery with the highest capacity is followed.

[0027] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A photovoltaic diesel storage and off-grid device, characterized in that: The system includes a photovoltaic base station, a diesel generator station, and an energy storage station. The photovoltaic panels in the photovoltaic base station are divided into multiple photovoltaic units, each connected to a shunt circuit. The shunt circuit has two output ports, each equipped with a first DC / DC converter and a second DC / DC converter. The output of the first DC / DC converter is connected to a first transfer charging circuit, and the output of the second DC / DC converter supplies power to the load. The electricity generated by the diesel generator station is transformed by a transformer. The transformer has two output ports, one directly supplying power to the load and the other connected to the input of a rectifier. The output of the rectifier is connected to a second transfer charging circuit. Both the first and second transfer charging circuits are connected to a selective charging unit. The selective charging unit has multiple charging interfaces, each corresponding to a battery cell in the energy storage station. The energy storage station supplies power to the load. The entire photovoltaic-diesel-energy storage-off-grid system is controlled by a control system.

2. The photovoltaic storage and off-grid device according to claim 1, characterized in that: The shunt circuit includes a multi-channel switching access circuit and two output circuits. The output terminal of each photovoltaic unit is connected to a switching access circuit. The output terminal of the switching access circuit is a two-way branch circuit and an electronically controlled switch is provided on the branch circuit. The two branch circuits are respectively connected to the two output circuits.

3. The photovoltaic storage and off-grid device according to claim 1, characterized in that: The first and second transfer charging circuits are identical. The first transfer charging circuit includes a main power line and multiple branch power lines branching off from the main power line.

4. The photovoltaic storage and off-grid device according to claim 3, characterized in that: The selected charging unit consists of multiple adapters, each with two input terminals and one output terminal. The branch transmission lines of the first and second adapter charging circuits are respectively connected to one output terminal of the adapter, and the output terminal of the adapter is a charging interface.

5. A photovoltaic diesel storage and off-grid device according to claim 1, characterized in that: Each energy storage battery in the energy storage power station is equipped with a power monitoring device, and the control system of the entire photovoltaic-diesel-storage-off-grid device is electrically connected to each power monitoring device.

6. A photovoltaic diesel storage and off-grid device according to claim 5, characterized in that: When the energy storage power station supplies power to the load, it first supplies power from the energy storage battery with the largest capacity. When the capacity is lower than 20%, it switches to other energy storage batteries to supply power.

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