CN202678984U - Solar photovoltaic system applied to grid-connected power supply of large-size civil buildings - Google Patents

Abstract

The utility model discloses a solar photovoltaic system applied to grid-connected power supply of a large-size civil building. The solar photovoltaic system comprises a solar photovoltaic matrix arranged on a peripheral structure surface of the large-size civil building, a controller, a grid-connected inverter and an alternating current load; and the solar photovoltaic system disclosed by the utility model is used for directly converting direct current from the solar photovoltaic matrix into alternating current through the grid-connected inverter and outputting the alternating current to a civil building distribution system in a grid-connected manner, so that the household solar system utilizing storage batteries is changed so as to meet the demands of illumination, air conditioners and electric appliances of a security room of the civil building, thereby not only improving the economic benefit and the social benefit of the civil building and realizing the active energy-saving effect of the building, but also playing a demonstrative function on the generalization of environmental-friendly solar energy in the nation.

Description

Solar photovoltaic system applied to grid-connected power supply for large civil buildings

technical field

The utility model relates to a solar photovoltaic system.

Background technique

As the concept of green energy continues to deepen among the people, people pay more and more attention to environmentally friendly green energy. In the existing solar energy system, it is mainly through setting up solar photovoltaic power generation equipment or solar power generation houses at specific locations with sufficient solar energy. To promote green solar technology to the majority of users, it is necessary to apply solar photovoltaic systems to large civil buildings and carry out adaptive transformation on them. The existing household solar power generation systems are connected to batteries through solar photovoltaic conversion panels. The converted electric energy is stored by the battery, and the electric energy in the battery is directly used to achieve the purpose of utilizing solar energy when in use, but this home solar power generation system is only suitable for small and medium-scale use of a single family. If each family is equipped with a set of equipment, not only the price High and expensive, and have not realized the uniform use of solar photovoltaic systems in large civil buildings.

Contents of the invention

In order to solve the above problems, the purpose of this utility model is to provide a solar photovoltaic system that can be used in large-scale residential buildings, is easy to popularize, and is applied to grid-connected power supply for large-scale residential buildings.

The technical solution adopted by the utility model to solve its problem is:

The solar photovoltaic system applied to the grid-connected power supply of large civil buildings, including the solar photovoltaic square array set on the surface of the outer structure of large civil buildings, the controller used to control the operation of the system, and the grid-connected inverter used to convert photovoltaic cells into electrical energy and an AC load for grid-connected connection to the power distribution system of civil buildings; the controller is respectively connected to the solar photovoltaic array and the grid-connected inverter, and the output end of the grid-connected inverter is connected to an AC load, and the AC The load is connected to the low-voltage outlet of the residential distribution transformer.

The photovoltaic system of the utility model installs a solar photovoltaic square array on the surface of the outer structure of a large civil building, uses a controller to perform multi-channel sequential control and intelligent control of the solar photovoltaic square array, and uses a grid-connected inverter to Reliable efficiency conversion of direct current, in which the grid-connected inverter adopts the maximum power tracking technology, which can maximize the electric energy converted by the photovoltaic cell to the power distribution system through the AC load, and the alternating current of the grid-connected inverter passes through the AC The load is connected to the low-voltage emergence end of the distribution transformer in parallel, realizing the mutual connection between the photovoltaic system and the civil building, and performing grid-connected power supply.

Preferably, the DC current component fed by the inverter to the grid does not exceed 1% of its AC rating.

Preferably, the solar photovoltaic array mainly uses monocrystalline silicon as its main raw material. Its photoelectric conversion efficiency is higher than other materials.

Further, it also includes a solar photovoltaic cell group, and the solar photovoltaic cell group is connected with the controller. The solar photovoltaic battery pack is used to store the electric energy after photoelectric conversion by the solar photovoltaic square array, and it is used for emergency power supply in case of power failure or power failure.

Further, a DC load for outputting a DC voltage is also included, and the DC load is connected with the controller. The controller can control the voltage and output the DC voltage through the DC load for the use of DC electrical appliances in civil buildings.

The beneficial effects of the utility model are: the utility model directly converts the direct current from the solar photovoltaic square array into an alternating current through the grid-connected inverter and outputs it to the civil building power distribution system, which changes the previous household solar system using batteries and meets The need for lighting, air conditioning, and security room electrical equipment in civil buildings can not only improve the economic and social benefits of large civil buildings, realize the effect of active energy saving in buildings, but also serve as a demonstration for the promotion of solar green energy in our country effect.

Description of drawings

Below in conjunction with accompanying drawing and example the utility model is described further.

Fig. 1 is a system schematic diagram of the solar photovoltaic system of the present invention.

Detailed ways

Referring to Fig. 1, the solar photovoltaic system of the present invention, which is applied to grid-connected power supply for large civil buildings, includes a solar photovoltaic square array 1 arranged on the surface of the peripheral structure of large civil buildings, a controller 2 for controlling the operation of the system, and a The grid-connected inverter 3 for converting photovoltaic cells into electrical energy and the AC load 4 for grid-connected connection to the civil building power distribution system; the controller 2 is connected to the solar photovoltaic array 1 and the grid-connected inverter 3 respectively , the output end of the grid-connected inverter 3 is connected to an AC load 4, and the AC load 4 is connected to a low-voltage outlet terminal of a residential distribution transformer.

The photovoltaic system of the utility model installs the solar photovoltaic square array 1 on the surface of the peripheral structure of a large civil building, uses the controller 2 to perform multi-channel sequential control and intelligent control on the solar photovoltaic square array 1, and uses the grid-connected inverter 3 to control the The direct current of the solar photovoltaic array 1 is converted with reliable efficiency, and the grid-connected inverter 3 adopts the maximum power tracking technology, which can maximize the electric energy converted by the photovoltaic cells and send it to the power distribution system through the AC load 4, among which the grid-connected The alternating current of the inverter 3 is connected in parallel to the low-voltage output terminal of the distribution transformer through the alternating current load 4, realizing the mutual connection between the photovoltaic system and the civil building, and performing grid-connected power supply.

The utility model directly converts the direct current from the solar photovoltaic square array 1 into alternating current through the grid-connected inverter 3 and outputs it to the grid-connected power distribution system of civil buildings, which changes the previous household solar system using batteries and meets the needs of lighting, The need for electrical equipment for air conditioners and security rooms can not only improve the economic and social benefits of large-scale civil buildings, realize the effect of active energy saving in buildings, but also play a demonstrative role in promoting solar green energy in our country.

The controller 2 is an intelligent controller, which is equipped with a temperature control compensation circuit inside, which can automatically cut off the load function, automatically restore the function of supplying power to the load, and can withstand the circuit protection of any load short circuit, and can withstand the charge controller 2 Circuit protection for internal short circuit, circuit protection that can withstand breakdown caused by lightning strikes.

When the working current of the grid-connected inverter 3 exceeds 150% of the rated value, the inverter can be automatically protected. When the current returns to normal, the equipment can automatically put into normal operation.

During normal operation, the allowable deviation of the three-phase voltage at the interface between the photovoltaic system and the grid is ±7% of the rated voltage, the frequency deviation is ±0.5 Hz, and the unbalance of the three-phase voltage does not exceed 2% of the allowable value. No more than 4%, the amount of harmonics generated meets the relevant technical requirements. When the grid into which the photovoltaic system is integrated loses voltage, it can automatically disconnect the photovoltaic system from the grid within the specified time limit to prevent the island effect.

Preferably, the DC current component fed by the inverter to the grid does not exceed 1% of its AC rating.

Preferably, the solar photovoltaic array 1 mainly uses monocrystalline silicon as its main raw material. Its photoelectric conversion efficiency is higher than other materials.

Further, a solar photovoltaic cell group 5 is also included, and the solar photovoltaic cell group 5 is connected with the controller 2 . The solar photovoltaic cell group 5 is used to store the electric energy converted by the solar photovoltaic array 1 for emergency power supply in case of power failure or power failure.

Further, a DC load 6 for outputting a DC voltage is also included, and the DC load 6 is connected with the controller 2 . The controller 2 can control the voltage to output a DC voltage through the DC load 6 for use by DC electrical appliances in civil buildings.

The above is only a preferred embodiment of the utility model, and the utility model is not limited to the above-mentioned embodiment, as long as it achieves the technical effect of the utility model by the same means, it should belong to the protection scope of the utility model.

Claims (3)

1. be applied to the be incorporated into the power networks solar energy photovoltaic system of power supply of large-scale civil buildings, it is characterized in that: comprise the photovoltaic square formation (1) that is arranged on large-scale civil buildings peripheral structure surface, be used for the control system operation controller (2), be used for the combining inverter (3) of photovoltaic cell converting electrical energy and be connected to the be incorporated into the power networks AC load (4) of connection of Distribution System in Civil Buildings; Described controller (2) links to each other with combining inverter (3) with photovoltaic square formation (1) respectively, and the output of described combining inverter (3) is connected with AC load (4), and AC load (4) links to each other with house owed by a citizen distribution transformer low-pressure line-outgoing end.

According to claim 1 be applied to large-scale civil buildings be incorporated into the power networks the power supply solar energy photovoltaic system, it is characterized in that: also comprise solar-energy photo-voltaic cell group (5), solar-energy photo-voltaic cell group (5) links to each other with controller (2).

According to claim 1 be applied to large-scale civil buildings be incorporated into the power networks the power supply solar energy photovoltaic system, it is characterized in that: also comprise the DC load (6) for output dc voltage, described DC load (6) is connected with controller (2).