CN204304495U - A kind of photovoltaic intelligent electricity generation system possessing second function - Google Patents

Abstract

The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic intelligent power generation system with a secondary power-off function. It includes power supply network, load, mains power supply, photovoltaic power supply system, energy storage system and diesel power supply system, and also includes an intelligent controller connected to the power supply network. The intelligent controller includes signal acquisition circuit modules and intelligent control circuit modules connected in sequence , a communication management module and an energy management module, the input end of the signal acquisition circuit module is connected to the power supply network, and the output end of the energy management module is connected to the power supply network. The invention greatly improves the power supply guarantee rate of important loads in special power supply occasions, and at the same time, enables the grid-connected photovoltaic power generation system to have higher energy utilization rate and use efficiency. Moreover, due to the secondary power-off of the photovoltaic power supply system, the frequency of use of the EPS emergency power supply and diesel generators is reduced, effectively saving resources and reducing the use cost.

Description

A photovoltaic intelligent power generation system with secondary power-off function

technical field

The utility model relates to the technical field of photovoltaic power generation, in particular to a photovoltaic intelligent power generation system with a secondary power-off function.

Background technique

Energy is the basic element of human existence and an important material basis for national economic and social development. With the development of economy and society, the demand for energy is increasing day by day. At the same time, the energy shortage, environmental pollution and greenhouse effect caused by burning coal, oil and other conventional energy cannot be ignored. In view of the limited supply of conventional energy and the increasing pressure of environmental protection, to fundamentally solve the energy crisis, my country must make full use of renewable energy to adjust the energy structure and promote sustainable economic and social development.

In recent years, due to the support of national policies and the improvement of national environmental protection awareness, my country's solar photovoltaic building integration and grid-connected power generation have developed rapidly. The advantage of the grid-connected photovoltaic power generation system is that it can save the battery and use the grid as its own energy storage unit. Because the battery is accompanied by energy loss during the process of storing and releasing electric energy, and the service life of the battery is usually only 5 to 8 years, and the discarded battery will pollute the environment. Therefore, the grid-connected photovoltaic system without the battery can not only greatly reduce the cost, but also greatly improve the reliability of the system, with higher power generation efficiency and better environmental protection performance. Integrating buildings with photovoltaics and grid-connected power generation has many advantages, such as: no pollution, no need to occupy expensive land, lower construction costs, no need for energy storage equipment, power generation at the location of power consumption avoids or reduces transmission and distribution losses Wait, a good integrated design will make the building cleaner and more beautiful, and it will be easily accepted by architects, users and the public, so it develops rapidly. However, grid-connected photovoltaic power generation systems have a distinctive feature: island protection. That is, when the mains power fails or fails, the photovoltaic system must immediately stop generating electricity even during the day. However, for some occasions such as: hospitals, banking systems, securities systems, telecommunications systems, chemical systems, power systems, railway systems, airports and other very important loads must maintain continuous power supply. However, the traditional grid-connected photovoltaic power generation system cannot guarantee to continue to provide power to some very important loads when the mains power fails or fails, that is to say, the traditional grid-connected photovoltaic power generation system does not have the function of secondary power-off.

Utility model content

The purpose of the utility model is to provide a photovoltaic intelligent power generation system with a secondary power-off function. It has the function of secondary power down, which can use the battery to supply power when the mains power fails or fails, and cut off the power supply of general loads. When the power supply of the battery is insufficient, it can cut off the secondary important load and use the diesel generator to continue to supply power to the very important load. Ensure the normal operation of very important loads.

The technical solution of the utility model is: a photovoltaic intelligent power generation system with the function of secondary power off, including a power supply network, a load, a mains power supply, a photovoltaic power supply system, an energy storage system and a diesel power supply system, the mains power supply, Both the output ends of the photovoltaic power supply system and the diesel power supply system are connected to the power supply network, the output ends of the power supply network are connected to the load, and an intelligent controller is included, and the intelligent controller includes signal acquisition circuit modules connected in sequence, intelligent control A circuit module, a communication management module and an energy management module, the input end of the signal acquisition circuit module is connected to the power supply network, and the output end of the energy management module is connected to the power supply network.

Further, it also includes a data acquisition and monitoring module connected to the power supply network, and the output end of the data acquisition and monitoring module is connected with a display and output module.

Further, it also includes a VCC power supply, and the VCC power supply is connected with the display and output module, the signal acquisition circuit module, the intelligent control circuit module, the communication management module and the energy management module.

Further, the photovoltaic power supply system includes a solar cell array and a photovoltaic microgrid inverter, and the output end of the solar cell array is connected to the power supply network through the photovoltaic microgrid inverter.

Further, the energy storage system includes a battery and an EPS emergency power supply connected between the battery and the power supply network.

Further, the diesel power supply system includes a diesel generator and an ATS automatic switching system, and the output end of the diesel generator is connected to the power supply network through the ATS automatic switching system.

Further, the loads include general loads, secondary important loads and very important loads.

The beneficial effects of the utility model are: an intelligent controller is added to the traditional power supply network, the signal acquisition circuit module in the intelligent controller collects the power supply conditions of various power sources through the power supply network, and the power supply of the mains power supply through the energy management module Automatically carry out the energy storage of the energy storage system, the switch between the mains power supply and the photovoltaic power supply system, and realize the secondary power-off function through the energy storage system and the diesel power supply system when the mains power supply fails or fails. The power supply guarantee rate of important loads in special power supply occasions is greatly improved, and at the same time, the grid-connected photovoltaic power generation system has higher energy utilization and efficiency. Moreover, due to the secondary power-off of the photovoltaic power supply system, the frequency of use of the EPS emergency power supply and diesel generators is reduced, effectively saving resources and reducing the use cost.

Description of drawings

Fig. 1 is the utility model module connection schematic diagram;

Fig. 2 is a system control flow chart;

In the figure: 1—photovoltaic power supply system, 2—energy storage system, 3—diesel power supply system, 4—intelligent controller.

Detailed ways

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute conflicts with each other.

As shown in Figure 1, the utility model includes a power supply network, a load, a mains power supply, a photovoltaic power supply system 1, an energy storage system 2 and a diesel power supply system 3, and the output ends of the mains power supply, the photovoltaic power supply system 1 and the diesel power supply system 3 are all Connected to the power supply network, the output end of the power supply network is connected to the load, and also includes a data acquisition and monitoring module connected to the power supply network, an intelligent controller 4, the output end of the data acquisition and monitoring module is connected to a display and output module, and an intelligent controller 1 includes a signal acquisition circuit module, an intelligent control circuit module, a communication management module and an energy management module connected in sequence, the input end of the signal acquisition circuit module is connected to the power supply network, and the output end of the energy management module is connected to the power supply network. It also includes a VCC power supply, which is connected with a display and output module, a signal acquisition circuit module, an intelligent control circuit module, a communication management module and an energy management module. Wherein, the photovoltaic power supply system 1 includes a solar cell array and a photovoltaic microgrid inverter, and the output end of the solar cell array is connected to the power supply network through the photovoltaic microgrid inverter. The energy storage system 2 includes a battery and an EPS emergency power supply connected between the battery and the power supply network. The diesel power supply system 3 includes a diesel generator and an ATS automatic switching system, and the output end of the diesel generator is connected to the power supply network through the ATS automatic switching system. Loads include general loads, secondary important loads and extra important loads.

The intelligent controller is the control core of the system, and it collects the working conditions of various power sources, including information such as voltage and current, through the signal acquisition circuit module. The intelligent control circuit module receives and organizes the data information collected by the signal acquisition circuit module, and makes logical judgments according to the preset control strategy, and sends execution instructions to the communication management module, which uses the TCP/IP protocol to upload real-time data to the Energy management module, and finally the energy management module performs comprehensive coordination, distribution and management of various energies. The data acquisition and monitoring module monitors the operating status of the system in real time and sends the working status to the display and output module for display and output in the form of images and text for human identification and monitoring.

As shown in Figure 2 is the control flow chart of the utility model, the working principle of the utility model is as follows: when the mains power supply is normal, if the power generated by the photovoltaic power supply system 1 is greater than the load power, the intelligent control circuit module sends a signal to the energy management The module cuts off the mains input and stores the excess power in the energy storage system 2. If the power generated by the photovoltaic power supply system 1 is less than the load power, the intelligent control circuit module sends a signal to the energy management module to connect to the mains power and the photovoltaic power supply system 1 to generate electricity power the load together. When the mains power fails or the transmission fails, the intelligent controller first judges whether the power generated by the photovoltaic power supply system 1 can meet the load power. The management module cuts off the power supply of general loads. At the same time, the remaining capacity of the battery is monitored, and when the set primary power-off capacity ratio is reached, the intelligent control circuit module sends a signal to the energy management module to cut off the power supply of the secondary important load for primary power-off; when the set secondary power-off capacity is reached When proportional, the intelligent control circuit module sends a signal to the energy management module to cut off the power supply of the battery to the extremely important load for a second power-off, and at the same time, the ATS automatic switching system immediately switches to the diesel generator, the switching time is milliseconds, and the diesel generator starts immediately Powering critical loads. When the mains voltage returns to normal operation, the intelligent control circuit module sends a signal to the energy management module to automatically shut down the diesel generator ATS automatic switching system and EPS emergency power supply, and at the same time perform the conversion operation from the mains power supply and photovoltaic power supply system.

The above is only a specific embodiment of the present utility model. It should be pointed out that any changes or replacements that can be easily imagined by those skilled in the art within the technical scope disclosed in the present utility model should be covered by the present utility model. within the scope of protection.

Claims (7)

1. A photovoltaic intelligent power generation system with secondary power-off function, including power supply network, load, mains power supply, photovoltaic power supply system, energy storage system and diesel power supply system, the mains power supply, photovoltaic power supply system and diesel power supply system The output ends of the system are all connected to the power supply network, the output ends of the power supply network are connected to the load, and it is characterized in that: it also includes an intelligent controller, and the intelligent controller includes a signal acquisition circuit module and an intelligent control circuit module connected in sequence . A communication management module and an energy management module, the input end of the signal acquisition circuit module is connected to the power supply network, and the output end of the energy management module is connected to the power supply network. 2. A photovoltaic intelligent power generation system with secondary power-off function as claimed in claim 1, characterized in that: it also includes a data acquisition and monitoring module connected to the power supply network, and the output terminal of the data acquisition and monitoring module Display and output modules are connected. 3. A photovoltaic intelligent power generation system with secondary power-off function as claimed in claim 1, characterized in that: it also includes a VCC power supply, said VCC power supply and display and output module, signal acquisition circuit module, intelligent control The circuit module, the communication management module and the energy management module are connected. 4. A photovoltaic intelligent power generation system with secondary power-off function as claimed in claim 1, characterized in that: said photovoltaic power supply system includes a solar cell square array and a photovoltaic microgrid inverter, and said solar cell The output end of the square array is connected to the power supply network through the photovoltaic microgrid inverter. 5. A photovoltaic intelligent power generation system with a secondary power-off function as claimed in claim 1, wherein the energy storage system includes a battery and an EPS emergency power supply connected between the battery and the power supply network. 6. A photovoltaic intelligent power generation system with secondary power-off function as claimed in claim 1, characterized in that: the diesel power supply system includes a diesel generator and an ATS automatic switching system, and the output of the diesel generator The terminal is connected to the power supply network through the ATS automatic switching system. 7. A photovoltaic intelligent power generation system with a secondary power-off function as claimed in claim 1, wherein said loads include general loads, secondary important loads and very important loads.