CN207475204U - A kind of energy-storage system available for photovoltaic generation - Google Patents

Abstract

The utility model relates to an energy storage system that can be used for photovoltaic power generation, which includes a solar energy collection module, which is used to collect solar energy and convert it into electric energy, and the solar energy collection module includes a solar energy collection board and a light energy converter; the energy storage module , the energy storage module is connected with the solar energy collection module, which is used to store the electric energy converted by the solar energy collection module; The electric energy provided by the energy module is reversed and boosted to a stable AC voltage and frequency to supply power to the load; the energy storage module includes at least two energy storage units, and each energy storage unit is connected to the grid in parallel; the energy storage The unit uses a ternary lithium battery pack as the energy storage core. The utility model greatly optimizes the volume and weight of the equipment and the charging and discharging efficiency of the battery, which is energy-saving and environmentally friendly. When the light intensity is insufficient, the power supply can be reasonably adjusted, and it is beneficial to the overall wiring planning of the system.

Description

An energy storage system that can be used for photovoltaic power generation

technical field

The utility model relates to the technical field of photovoltaic power generation, in particular to an energy storage system that can be used for photovoltaic power generation.

Background technique

With the gradual depletion of traditional petroleum energy, green renewable energy has developed rapidly. Solar photovoltaic power generation technology has received constant attention from various countries and has become one of the main ways to utilize solar energy. Carrying out research on solar photovoltaic power generation systems has great theoretical and practical significance for alleviating energy and environmental problems, improving energy consumption structure, improving the performance of distributed power generation systems, and developing the photovoltaic power generation industry.

The energy storage batteries currently used for photovoltaic power generation are based on colloidal batteries, lead-acid batteries and iron phosphate batteries, which have low charge and discharge efficiency, short service life, and large volume and weight.

Utility model content

The utility model adopts a ternary lithium battery pack, which has twice the energy efficiency and 2/3 volume of a conventional battery, controlled by an MPPT circuit, and the charging and discharging efficiency is as high as 98%, which greatly optimizes the volume and weight of the equipment and the charging and discharging efficiency of the battery.

The technical scheme adopted in the utility model is as follows:

A kind of energy storage system that can be used for photovoltaic power generation, it comprises

A solar energy collection module, which is used to collect solar energy and convert it into electrical energy, the solar energy collection module includes a solar energy collection plate and a light energy converter;

An energy storage module, the energy storage module is connected with the solar energy collection module, and it is used to store the electric energy converted by the solar energy collection module;

An inverter boost module, the inverter boost module is connected to the energy storage module, which is used to invert and boost the electric energy provided by the energy storage module into a stable AC voltage and frequency, and supply power to the load;

The energy storage module includes at least two energy storage units, and each energy storage unit is connected to the grid in parallel;

The energy storage unit uses a ternary lithium battery pack as the energy storage core.

The above-mentioned energy storage module can meet the following functional requirements when used as the main power supply of the grid: it supports a maximum of multiple parallel connections, adopts no master-slave control, and the failure of any one will not affect other work, meeting the requirements of system redundancy and expansion.

Preferably, the solar collection module includes solar collection units equal to the number of energy storage units, and the solar collection units include solar collection panels and light energy converters; each solar collection unit is connected to an energy storage unit, A single provides energy for the energy storage unit.

Preferably, the energy storage unit is connected with an energy storage conversion control unit, the energy storage conversion control unit is used to control charging and discharging of the lithium battery pack, and the energy storage conversion control unit is connected to the inverter boost module.

The inverter boost module includes an inverter, a transformer and a high-voltage switch, and the inverter is connected to the energy storage module to convert the electric energy of the energy storage module into alternating current.

Preferably, an RS485 communication interface is installed on the energy storage unit, and the RS485 communication interface is used to manage the ternary lithium battery pack in the energy storage unit, monitor and transmit the state information of the lithium battery pack.

The energy storage system can provide stable AC voltage and frequency and support bidirectional flow of energy. When the solar energy is sufficient, the solar energy collection board collects light energy, converts it into electrical energy through a light energy converter, and the energy storage conversion control unit controls the charging of the ternary lithium battery pack; when the solar energy is insufficient or at night, the energy storage conversion control unit controls the ternary lithium battery When the battery pack is discharged, the electric energy stored in the lithium battery pack flows into the inverter to be converted into alternating current, and then the alternating current is processed into a stable voltage and frequency through a transformer, and then merged into the urban power grid.

The working method of the energy storage system is: through the charging and discharging controller in the energy storage conversion control unit to realize perfect battery management, it has the function of three-stage charging of the energy storage battery. The energy storage system has a constant power source function, and the power level can be set by the user's host computer or the internal logic controller. When the battery capacity can meet the system requirements, the converter works in a constant power state; when the battery is fully charged, the system automatically exits the constant power mode and enters the floating charge mode.

Implementing the technical solution of the utility model has the following advantages and positive effects:

(1) The volume and weight of the device and the charging and discharging efficiency of the battery are greatly optimized.

(2) Energy saving and environmental protection. When the light intensity is insufficient, the power supply can be reasonably adjusted.

(3) It is beneficial to the overall wiring planning of the system.

Description of drawings

Figure 1 is a structural schematic diagram of an energy storage system that can use photovoltaic power generation in the utility model

Figure 2 is a flow diagram of the energy storage system when light energy is sufficient;

Fig. 3 is a flow diagram of the energy storage system when light energy is insufficient.

Detailed ways

In order to make the technical solution of the utility model easier to understand, the technical solution of the utility model is described clearly and completely by means of specific embodiments in conjunction with the accompanying drawings. It should be noted that the embodiments described here are only some embodiments of the present utility model, rather than all implementations of the present utility model. The content of the utility model is more intuitive and clear, rather than limiting the technical solution of the utility model. On the premise of not departing from the concept of the utility model, all other implementations that can be thought of by those of ordinary skill in the art without creative work, as well as other simple replacements and various changes to the technical solution of the utility model, all belong to the utility model scope of protection.

Example 1

The utility model discloses an energy storage system that can be used for photovoltaic power generation, which includes a solar energy collection module, which is used to collect solar energy and convert it into electric energy, and the solar energy collection module includes a solar energy collection board and a light energy converter; energy storage Module, the energy storage module is connected with the solar energy collection module, which is used to store the electric energy converted by the solar energy collection module; the inverter boost module includes an inverter, a transformer and a high voltage switch, and the inverter boost module is connected with the The energy storage modules are connected, and are used to invert and boost the electric energy provided by the energy storage modules into a stable AC voltage and frequency to supply power to the load.

As shown in Figure 1, the energy storage module includes two energy storage units, which are connected to the grid in parallel, and each energy storage unit is connected to a solar energy collection unit; the energy storage unit is made of ternary lithium The battery pack serves as the core of energy storage, the ternary lithium battery is connected to the energy storage conversion control unit, and the energy storage conversion control unit is connected to the inverter.

An RS485 communication interface is installed on the energy storage unit, and the RS485 communication interface is used to manage the ternary lithium battery in the energy storage unit, monitor and transmit the status information of the lithium battery pack.

The energy storage system can provide stable AC voltage and frequency and support bidirectional flow of energy. As shown in Figure 2, when the solar energy is sufficient, the solar energy collection board collects light energy and converts it into electrical energy through a light energy converter. The energy storage conversion control unit controls the charging of the ternary lithium battery pack. When it is fully charged, stop charging; as shown in Figure 3, when solar energy is insufficient or at night, the energy storage conversion control unit controls the discharge of the ternary lithium battery pack, so that the electric energy stored in the lithium battery pack flows into the inverter and is converted into alternating current, and the alternating current is then It is processed into a stable voltage and frequency through a transformer and incorporated into the urban power grid.

The working mode of the energy storage system is: perfect battery management, with three-stage charging function of the energy storage battery. The energy storage system has a constant power source function, and the power level can be set by the user's host computer or the internal logic controller. When the battery capacity can meet the system requirements, the converter works in a constant power state; when the battery is fully charged, the system automatically exits the constant power mode and enters the floating charge mode.

The technical solution has the following advantages and positive effects:

(1) The volume and weight of the device and the charging and discharging efficiency of the battery are greatly optimized.

(2) Energy saving and environmental protection. When the light intensity is insufficient, the power supply can be reasonably adjusted.

(3) It is beneficial to the overall wiring planning of the system.

Embodiments of the present utility model have been described above in conjunction with the accompanying drawings, but the present utility model is not limited to the above-mentioned specific implementation, and the above-mentioned specific implementation is only illustrative, rather than restrictive. Under the enlightenment of the utility model, personnel can also make many forms without departing from the scope of protection of the purpose of the utility model and claims, and these all belong to the protection of the utility model.

Claims (5)

1. a kind of energy-storage system available for photovoltaic generation, it includes

Solar energy acquisition module is used to acquire solar energy and converts thereof into electric energy, and the solar energy acquisition module is included too Positive energy collection plate and light energy converter；

Energy-storage module, the energy-storage module are connected with solar energy acquisition module, are used to storing solar energy acquisition module and turn The electric energy changed；

Inversion boosting module, the inversion boosting module are connected with energy-storage module, are used for the electric energy for providing energy-storage module Alternating voltage and frequency of the inversion boosting for stabilization, powering load；

It is characterized in that：

The energy-storage module includes at least two energy-storage units, and each energy-storage units access power grid in parallel；

The energy-storage units are using ternary lithium battery group as energy storage core.

2. energy-storage system according to claim 1, which is characterized in that the solar energy acquisition module includes and energy-storage units The mutually equivalent solar energy acquisition unit of quantity, the solar energy acquisition unit include solar energy collecting plate and light energy converter；Often A solar energy acquisition unit is connected with an energy-storage units, single to provide energy for the energy-storage units.

3. energy-storage system according to claim 1 or 2, which is characterized in that the energy-storage units are connected with energy storage conversion control Unit processed, the energy storage TCU transfer control unit are used to control the lithium battery group charge and discharge, and the energy storage conversion and control list Member access inversion boosting module.

4. energy-storage system according to claim 1, which is characterized in that the inversion boosting module includes inverter, transformation Device and high-voltage switch gear, the inverter are connected with the energy-storage module, and the electric energy of energy-storage module is converted into alternating current.

5. energy-storage system according to claim 3, which is characterized in that RS485 communications are equipped on the energy-storage units and are connect Mouthful, the RS485 communication interfaces are used to monitor and transmit the status information of lithium battery group.