Complementary power supply system based on direct current coupling

Abstract

A complementary power supply system based on direct-current coupling comprises a photovoltaic power generation mechanism, an alternating-current power generation mechanism connected with the photovoltaic power generation mechanism through a first power transmission line, a power storage mechanism, a first inverter and a load electrically connected with the first inverter, wherein the power storage mechanism and the first inverter are electrically connected with the first power transmission line, and the load is electrically connected with a mains supply power grid. The first inverter is used for converting direct current into alternating current so that electric power can be supplied to a load, the photovoltaic power generation mechanism comprises a photovoltaic controller connected with the first power transmission line and a photovoltaic panel electrically connected with the photovoltaic controller, and the alternating current power generation mechanism comprises a second inverter connected with the first power transmission line and an alternating current generator electrically connected with the second inverter. And the inverter II is used for converting the alternating current into direct current. The complementary power supply system based on direct current coupling provided by the utility model can store redundant electric power and supply the stored electric power to a load when the electric power is insufficient, thereby not only realizing complementary power supply, but also saving commercial power.

Description

Technical Field

[0001] The utility model belongs to the field of power supply, and in particular relates to a complementary power supply system based on direct current coupling. Background Art

[0002] The following situation often occurs when using solar power generation: when electricity consumption is low during the day, for loads with lower power, the amount of solar power generated will be more than the amount of electricity needed by the load, while at night when electricity consumption is high, solar power generation cannot be used, so excess electricity may be generated during the day, and at night the load can only be powered by mains electricity or generators. Therefore, in order to reasonably utilize electricity when photovoltaic power generation is high and to save electricity when photovoltaic power generation is low, a complementary power supply system is needed. The present utility model solves this technical problem. Utility Model Content

[0003] The utility model provides a complementary power supply system based on DC coupling, which can store excess power and supply the stored power to the load when power is insufficient, thereby achieving complementary power supply and saving mains electricity.

[0004] A complementary power supply system based on DC coupling includes a photovoltaic power generation mechanism, an AC power generation mechanism connected to the photovoltaic power generation mechanism via a transmission line, a power storage mechanism and an inverter electrically connected to the transmission line, a load electrically connected to the inverter, and the load electrically connected to a commercial power grid.

[0005] Furthermore, the photovoltaic power generation mechanism includes a photovoltaic controller connected to the transmission line and a photovoltaic panel electrically connected to the photovoltaic controller.

[0006] Furthermore, the AC power generation mechanism includes an inverter 2 connected to the transmission line 1 and an AC generator electrically connected to the inverter 2.

[0007] Furthermore, the power storage mechanism adopts a battery, and the battery is used to store electricity and supply electricity to the load.

[0008] Furthermore, the inverter 1 is connected to the circuit breaker 1, the circuit breaker 1 is electrically connected to the commercial power grid through the transmission line 2, and the load is electrically connected to the transmission line 2.

[0009] Furthermore, the photovoltaic controller is connected to circuit breaker 2, and the circuit breaker 2 is connected to the photovoltaic panel.

[0010] The technical effects of the utility model are as follows:

[0011] (1) The photovoltaic power generation mechanism in this scheme can provide a certain amount of power for the load. When the load power is less than the photovoltaic power generation power, the excess power can be stored in the battery. When the load power is greater than the photovoltaic power generation power, the battery with stored power can supply power to the load, thereby achieving complementary power supply and saving mains electricity.

[0012] (2) When there is a power outage and the power provided by batteries and photovoltaic power generation is insufficient, the AC generator can be used to generate electricity to provide power to the load, thereby improving the reliability of power supply;

[0013] (3) When the load power is large and photovoltaic power generation and batteries are unable to meet the load demand, power can be supplied through the mains power grid. Photovoltaic power generation can save part of the mains power, and batteries can balance the power, thereby ensuring the normal power consumption of the load while saving power. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the present utility model.

[0015] Among them, the figures are marked as: 1. AC generator; 2. Inverter 2; 3. Battery; 4. Transmission line 1; 5. Photovoltaic controller; 6. Circuit breaker 2; 7. Photovoltaic panel; 8. Inverter 1; 9. Circuit breaker 1; 10. Load; 11. AC power grid. DETAILED DESCRIPTION

[0016] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments and drawings.

[0017] See also Figure 1 A complementary power supply system based on DC coupling includes a photovoltaic power generation mechanism, an AC generator 1 connected to the photovoltaic power generation mechanism via a transmission line 4, a power storage mechanism and an inverter 8 electrically connected to the transmission line 4, a load 10 electrically connected to the inverter 8, and the load 10 is electrically connected to a utility grid 11. The inverter 8 is used to convert DC power into AC power, so that the power can be supplied to the load 10.

[0018] Furthermore, the photovoltaic power generation mechanism includes a photovoltaic controller 5 connected to the transmission line 4 and a photovoltaic panel 7 electrically connected to the photovoltaic controller 5.

[0019] Furthermore, the AC generator 1 includes an inverter 2 connected to the transmission line 1 4 and an AC generator 1 electrically connected to the inverter 2 2. The inverter 2 2 is used to convert AC power into DC power. The AC generator 1 in this embodiment is a diesel generator.

[0020] Furthermore, the power storage mechanism adopts a battery 3 , which is used to store power and supply power to the load 10 .

[0021] Furthermore, inverter 1 8 is connected to circuit breaker 1 9 , circuit breaker 1 9 is electrically connected to the utility grid 11 through transmission line 2 , and load 10 is electrically connected to transmission line 2 .

[0022] Furthermore, the photovoltaic controller 5 is connected to the second circuit breaker 6 , and the second circuit breaker 6 is connected to the photovoltaic panel 7 .

[0023] The working principle of this utility model is as follows:

[0024] When the load power is low and there is sufficient sunlight during the day, the electricity generated by the photovoltaic panel 7 is converted into AC power by the inverter 8 and supplied to the load 10. It can also supply power to the battery 3 and store the excess power in the battery 3. When the photovoltaic panel 7 cannot generate power at night, the battery 3 can be used to supply power to the load 10, thereby saving the power of the mains.

[0025] When the load power is large and the power generated by the photovoltaic panel 7 alone is insufficient for the load 10 to operate normally, the load 10 can be powered by the mains electricity on this basis to enable it to operate normally. Since photovoltaic power generation is not stable, it is necessary to use the battery 3 for power balancing. Under the premise of ensuring the normal operation of the load 10, the excess power generated by photovoltaic power generation can be stored in the battery 3, and the insufficient power can be supplemented by the battery 3. The power of the battery 3 can be supplemented by photovoltaic power generation or the AC generator 1;

[0026] When there is a power outage and the power provided by the battery 3 or photovoltaic power generation is insufficient, the AC generator 1 can generate electricity to provide power to the load 10.

[0027] The above embodiments are only preferred embodiments of the present invention. Those skilled in the art can derive other embodiments from the above embodiments without creative work. Therefore, this application protects not only the above embodiments, but also the scope consistent with the principles and features of this application.

Claims

1. A complementary power supply system based on DC coupling, characterized in that: The invention comprises a photovoltaic power generation mechanism, an AC generator (1) connected to the photovoltaic power generation mechanism via a transmission line (4), a power storage mechanism and an inverter (8) electrically connected to the transmission line (4), a load (10) electrically connected to the inverter (8), and the load (10) electrically connected to a commercial power grid (11).

2. The complementary power supply system based on DC coupling according to claim 1, characterized in that: The photovoltaic power generation mechanism includes a photovoltaic controller (5) connected to the transmission line (4) and a photovoltaic panel (7) electrically connected to the photovoltaic controller (5).

3. The complementary power supply system based on DC coupling according to claim 1, characterized in that: The AC generator (1) comprises an inverter 2 (2) connected to the transmission line 1 (4), and an AC generator (1) electrically connected to the inverter 2 (2).

4. The complementary power supply system based on DC coupling according to claim 1, characterized in that: The power storage mechanism adopts a storage battery (3), and the storage battery (3) is used to store power and supply power to the load (10).

5. The complementary power supply system based on DC coupling according to claim 1, characterized in that: The inverter 1 (8) is connected to the circuit breaker 1 (9), the circuit breaker 1 (9) is electrically connected to the commercial power grid (11) through the transmission line 2, and the load (10) is electrically connected to the transmission line 2.

6. The complementary power supply system based on DC coupling according to claim 2, characterized in that: The photovoltaic controller (5) is connected to the second circuit breaker (6), and the second circuit breaker (6) is connected to the photovoltaic panel (7).

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