CN204062816U - A kind of concentrated energy storage type solar LED street lamp system - Google Patents

Abstract

A centralized energy storage type solar LED street lamp system, including multiple solar panels and multiple LED street lamps, multiple solar panels are connected to the controller through the first DC line; multiple LED street lamps are connected to the controller through the first DC line the controller; the controller is connected to a plurality of lead-acid storage battery groups through the second direct current line. The utility model is a centralized energy storage type solar LED street lamp system. On the basis of not increasing the total design cost, the solar LED street lamps are segmented to perform centralized energy storage, and a centralized controller is used for this section of the system to realize reasonable energy distribution. . Not only is it beneficial to reduce the difficulty of replacing the lead-acid battery pack, facilitate construction, but also improve the utilization rate of energy.

Description

A centralized energy storage solar LED street light system

technical field

The utility model relates to a centralized energy storage type solar LED street lamp system, which relates to the field of solar photovoltaic applications.

Background technique

Solar energy is a safe, reliable, convenient and flexible renewable clean energy. The application scale and scope of solar photovoltaic technology is rapidly expanding, and it is widely used in space, transportation, lighting, and communication. Solar LED street light is a kind of light that uses solar energy as energy. As long as there is sufficient sunlight, it can be installed on the spot without long-distance connection to the public power grid. Solar street lights are mainly composed of solar cell components (including brackets), LED lamp holders, controllers, lead-acid battery packs and light poles. The working principle of solar LED street lights is that the solar street lights are under the control of the controller during the day, the solar panels are irradiated by sunlight, absorb sunlight and convert it into electrical energy, the photovoltaic modules charge the lead-acid battery pack during the day, and the lead-acid battery pack provides power to the The LED lamp is powered to realize the lighting function. The controller ensures that the lead-acid battery pack will not be damaged due to overcharge or overdischarge, and has functions such as light control, time control, temperature compensation, lightning protection, and reverse polarity protection.

Solar LED street light is a work of art integrating light, electricity, mechanical control and other technologies. It must be unified and coordinated with the surrounding environment. It must consider its beautiful appearance and reasonable structure. The capacity of the group and the size of the load power can ensure the reliable operation of the system and achieve the best economic benefits. At present, the existing solar LED street lamps adopt the single-lamp independent energy storage and power supply mode, that is, each street lamp is equipped with a set of lead-acid batteries for energy storage and power supply. In fact, in the solar LED street light system, the life of photovoltaic cell components is about 20 years, and the average life of LED lamp holders can reach 10 years, while the actual life of lead-acid battery packs is generally only 2-3 years. The life of the system is much shorter than other parts of the system.

During the installation process of solar LED street lights, the distance between light poles is related to factors such as the width of the road and geographical location. It is roughly set at about 30 meters. At present, the road solar LED street light system adopts the single-lamp independent energy storage power supply mode. Due to the volume, weight and other reasons, the lead-acid battery pack is generally placed under the street lamp nearby, and then connected to the controller with a wire. The road street lighting system needs to dig a cement waterproof tank under the light pole every 30 meters or so to house the lead-acid battery pack. Because the lead-acid battery pack often needs maintenance, its life is relatively short, and it is buried in the ground for special installation. All forms have a great impact on the basic maintenance and troubleshooting of solar LED street lights, thereby increasing maintenance costs.

In view of the above problems, the utility model proposes a solution to use the centralized energy storage power supply mode of the solar LED street lamp system to replace the single lamp independent energy storage power supply mode. The following is a brief description of how to implement the centralized energy storage power supply mode of the solar LED street light system in urban streets: the length of the main roads in urban streets is generally 8-12km, and the distance between light poles is about 30 meters, so a main road has roughly 533-800 street lamps.

If these street lamp energy storage devices——the lead-acid battery packs are all used for centralized energy storage, the required centralized energy storage lead-acid battery packs will have a very large capacity.

In the design of actual solar LED street lamp products, in order to ensure the reliability of energy storage and power supply, the capacity of energy storage components required by each solar LED street lamp is generally 12V, 38-150AH. Lead-acid battery products are mass-produced according to a certain nominal capacity. In solar LED street lamp systems, the commonly used valve-regulated sealed lead-acid battery capacity specifications are 12V, 100AH, and the load voltage is generally 24V, so for single lamps In the independent energy storage power supply mode, two 12V, 100AH lead-acid batteries are usually used in series to supply power to the load. Batteries produced by different manufacturers are different in appearance design and size, but the size difference is not large. Taking "Aotedo" valve-regulated sealed lead-acid battery as an example, the size of the 12V, 100AH battery is 335* 172*214mm.

When determining the number of solar LED street lights with centralized energy storage, the following factors need to be considered. First, the number of parallel connections of lead-acid battery packs. The more solar LED street lamps participating in centralized energy storage, the larger the capacity of the lead-acid battery pack required for energy storage, and the number of parallel connection of lead-acid battery packs should not be too large, in order to minimize the difference between the lead-acid battery packs impact on balance. Second, the transmission distance. The working condition of the solar LED street light system is low-voltage direct current. In addition, the LED light source is energy-saving and efficient, and the power supply current is not large. The energy transmission can be reliably realized by using ordinary transmission lines. The line cost is low, which is conducive to the centralized energy storage design of solar LED street lights. However, when the power transmission distance is too large, the transmission cost of the power storage line used for centralized energy storage design cannot be ignored, so it is not suitable to centralize energy storage for solar LED street lights that are far apart. Third, the battery installation space. When conducting centralized design for lead-acid batteries, for the convenience of installation and maintenance, a battery room can be built to store the batteries instead of burying the batteries underground. Limited by the geographical environment, the volume of the battery room should not be too large.

Contents of the invention

The utility model provides a centralized energy storage type solar LED street lamp system. On the basis of not increasing the total design cost, the solar LED street lamps are segmented for centralized energy storage, and a centralized controller is used for the section system to realize reasonable energy. distribute. Not only is it beneficial to reduce the difficulty of replacing the lead-acid battery pack, facilitate construction, but also improve the utilization rate of energy.

The technical solution adopted by the utility model is: a centralized energy storage type solar LED street lamp system, including multiple solar panels and multiple LED street lamps, multiple solar panels connected to the controller through the first DC line; multiple LED The street lamp is connected to the controller through the first direct current line; the controller is connected to multiple lead-acid storage batteries through the second direct current line.

Multiple solar panels are connected in parallel to the controller. Multiple LED street lights are connected to the controller in parallel, and each LED street light can work independently.

The controller and a plurality of lead-acid battery packs are installed in the battery room.

A lead-acid battery pack is composed of: 2 lead-acid battery units connected in series first, and then 4 sets of 2 battery units in series are connected in parallel to form a lead-acid battery pack for 8 LED street lamps 4 energy storage and power supply.

One battery unit is a 12V, 200AH lead-acid battery.

Each LED street lamp is composed of multiple light-emitting diodes connected.

The utility model is a concentrated energy storage type solar LED street lamp system, and the technical effect is as follows:

1) The controller is used to control solar panels, lead-acid battery packs and LED lights. It is installed near the lead-acid battery pack and can distribute energy to LED lights.

2) LED lights are the load in the solar LED street light system. For the centralized energy storage system, the LED lights are connected in parallel to both ends of the controller, which can be used for independent lighting, and the energy acquisition is distributed by the controller.

3) Implement segmented centralized energy storage for LED street lamps, and uniformly distribute the energy of LEDs through an integrated controller, and determine the number of street lamps to be turned on by detecting the total stored power of the battery. When the energy storage of the lead-acid battery pack is insufficient, the street lamps in this section can be controlled to turn off the lighting at intervals. Although the lighting intensity is reduced, a certain lighting demand can still be met, so the lighting time of the street lamps can be increased.

4) Due to the use of centralized energy storage, the workload of installation and replacement of energy storage equipment is greatly reduced, the construction efficiency is improved, and the installation cost can be reduced.

Description of drawings

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

Fig. 2 is the utility model system control circuit diagram.

Detailed ways

As shown in Figure 1, a centralized energy storage type solar LED street lamp system includes a plurality of solar panels 1 and a plurality of LED street lamps 4, and a plurality of solar panels 1 are connected to a controller 2 through a first DC line 5; Each LED street lamp 4 is connected to the controller 2 through the first direct current line 5; the controller 2 is connected to a plurality of lead-acid battery packs 3 through the second direct current line 6. Since the lead-acid battery pack 3 has the function of charging and discharging, the second DC line 6 between it and the controller 2 has the capability of bidirectional conduction, and the current flow of the line is related to the working state of the lead-acid battery pack 3 .

A plurality of solar panels 1 are connected to a controller 2 in parallel. A plurality of LED street lamps 4 are connected in parallel to the controller 2, and each LED street lamp 4 can work independently, so any failure of any one of the LED street lamps 4 will not affect the work of other street lamps. The controller 2 and a plurality of lead-acid battery packs 3 are installed in the battery room 5 .

The utility model is a centralized energy storage type solar LED street lamp system. By setting the controller 2, the charging and discharging of multiple lead-acid storage battery groups 3 are controlled according to the detection of the working state of the solar battery panel 1, and according to the monitoring of multiple lead-acid The voltage of the battery pack 3 is used to determine the amount of stored energy, and the time setting system is used to control the on-off state of the load LED street lamp 4 and the number of on-off LED street lamps 4 . The whole process is completely intelligently controlled by the controller 2 without manual intervention.

When there is sunlight during the day, the solar panel 1 converts solar energy into electrical energy, and stores it in the lead-acid battery pack 3 through the controller 2 . When there is no sunlight at night, a plurality of lead-acid battery packs 3 distribute energy to LED street lamps 4 through the controller 2 for lighting. The controller 2 controls the time and quantity of the switches of a plurality of LED street lamps 4 .

First of all, in terms of time, this can be adjusted according to the different seasons of spring, summer, autumn and winter. Spring and Autumn: Controller 2 turns off the LED lights at 6:00 a.m. and turns them on at 6:00 p.m. Summer: the controller turns off the LED street light 4 at 5 o'clock in the morning, and turns on the lights at 7 o'clock in the evening. Winter: the controller turns off the LED street light 4 at 7:00 a.m. and turns it on at 5:00 p.m. Then, in terms of quantity, when the power of multiple lead-acid battery groups 3 is not very sufficient, the remaining power is calculated by detecting the voltage of multiple lead-acid battery groups 3, so as to determine the number of groups that can supply the normal work of solar LED street lights At this time, you can choose to turn on and off the street lights at intervals to increase the lighting time. The controller 2 is mainly used to coordinate the work of the solar panel 1 , the lead-acid battery pack 3 and the LED street lamp 4 . It includes solar charge and discharge point control function to protect the lead-acid battery pack 3; also implements maximum power tracking on the solar panel 1, and ensures the stability of the direct current generated by the photovoltaic cell; in addition, it also has other basic functions such as light source control, Time control, control of the number of LED on, etc. And it is necessary to integrate the controller 2 so that one controller 2 can coordinately control multiple solar panels 1 and multiple LED street lamps 4 .

The working voltage of the LED street lamp 4 is set to 24V in this case, and each LED street lamp 4 is composed of a plurality of light-emitting diodes. LED lights have the characteristics of environmental protection, no pollution, low power consumption, high light efficiency, and long life.

The lead-acid battery pack 3 is mainly used to store the electrical energy converted by the solar panel 1 in the form of chemical energy during the day, and convert the chemical energy into electrical energy for the LED street lamp 4 at night. In order to reduce the complexity of installing and replacing the lead-acid battery pack 3, the LED street lamps at a certain distance are used for centralized energy storage. In order to reduce the wiring cost, the middle position of this section of the road is selected to concentrate multiple lead-acid battery packs 3 Install.

Example:

In each centralized energy storage solar LED street lamp system of the present utility model, a 12V, 200AH lead-acid battery is used for energy storage, and the size of a 12V, 200AH lead-acid battery is about 522*240*218mm. When the capacity of the lead-acid battery pack 3 is the same, the total volume occupied by the 12V, 200AH battery is smaller than that of the 12V, 100AH battery, and the use of a large-capacity battery can reduce the number of batteries connected in parallel. The number of parallel groups of storage batteries generally does not exceed 4 groups, so in this utility model, two 12V, 200AH lead-acid batteries are connected in series to meet the requirement that the load input voltage is 24V, and then the lead-acid batteries connected in series are taken as 4 The groups are connected in parallel to form a lead-acid storage battery group 3, which together provide energy storage and power supply for 8 LED street lamps. There are 144 LED street lights 4 in total. Parallel connection can make the lead-acid battery pack work as a backup for each other, increasing the power supply reliability of solar LED street lights. In addition, in order to minimize the total power transmission distance, the battery room 5 is chosen to be installed in the middle of the solar street lamps participating in centralized energy storage. Weighing the above factors, in the utility model, each storage battery room 5 is allowed to place no more than 144 12V, 200AH lead-acid storage batteries, that is: 18 groups of lead-acid storage battery groups 3 . Therefore, for a main road with a length of 8-12 km, 2-3 battery rooms 5 with a volume of 3.2*2*2m need to be built on both sides of the road. The storage battery room 5 considers that there is a certain gap in the middle when the storage battery is placed, and reserves a part of the volume to place other supporting equipment.

working principle:

Switching devices Ti and Si, diodes VDi and VD'i, fuse BX in each street lamp unit, and temperature, photosensitive and voltage sensor measurement and detection circuits arranged near the controller together form the auxiliary circuit of the controller 2. The auxiliary circuit of the controller 2 satisfies the following functions: 1) Monitor the battery pack voltage u through the voltage sensor; 2) Measure the light intensity r through the photosensitive sensor to assist in judging the solar panel 1 and LED street lamp 4 in the street lamp unit working status. 3) Measure the real-time temperature t through the temperature sensor to realize the temperature compensation function. The core chip of the controller 2 adopts DSP28335, which is a multi-input multi-output controller, which can simultaneously control the charging and discharging of multiple lead-acid battery packs 3 in parallel to realize the rational distribution of their energy. According to the design requirements of the utility model, the controller 2 is designed to be able to control at least 18 battery packs.

The workflow of the controller 2 and its auxiliary circuits is shown in Figure 2. PVi (i=1, 2, ..., n) is the solar panel of each street lamp; VDi (i = 1, 2, ..., n) is the anti-reverse charging diode; VD'i (i = 1, 2, ... , n) are anti-reverse diodes; Ti (i=1, 2, ..., n) is a switch to control the charging circuit, Si (i = 1, 2, ..., n) is a switch to control battery discharge; BX is a fuse; The detection control circuit monitors the terminal voltage u of the battery to control the opening and closing of Ti and Si; the battery indicates the batteries installed in the entire battery room 5, which are combined and placed in the form of 2 strings and 4 parallels; Li is an LED light.

The controller 2 uses the switching device Ti connected in parallel in the battery charging circuit to control the changing process of the charging current i. The detection circuit of the controller 2 monitors the terminal voltage u of the battery. When the charging voltage exceeds the full-charge disconnection voltage set by the battery, the controller 2 controls Ti according to (T1, T9, T17, ...) → (T2, T10, T18, ... )→…→(T8, T16, T24,…) are divided into 8 groups to gradually turn off the switch Ti to realize the adjustment of the charging voltage u and current i of each group of batteries. This form of continuous adjustment can avoid sudden changes in electrical parameters , which is conducive to the protection of equipment. By controlling the switch Ti, it plays a protective role to prevent the battery from being overcharged.

Si (i=1, 2, ..., n) is the battery discharge control switch. When the detection control circuit detects the voltage u of the battery and judges that the continuous power supply time of the battery is lower than the required power supply time, control switches S2 and S4 , S6, S8, ... are turned off; and the switches S1, S3, S5, S7, ... are kept on to supply power to the LED street lamp 4 and provide lighting. When the power supply voltage of the battery is lower than the over-discharge protection voltage of the battery, the controller continues to control the switch Si, so that the remaining S1, S3, S5, S7, ... are also turned off. Therefore, by controlling the switch Si, it can not only protect the battery from over-discharge, but also realize energy distribution in the form of segmented control, and increase the lighting time as much as possible.

VD'i (i=1, 2,..., n) in the circuit is a battery reverse protection diode. When a certain battery is reversed, the corresponding VD'i is turned on, and the battery will be short-circuited and discharged through VD'i. The fuse BX of the corresponding unit will be blown by the short-circuit current to protect against battery reverse polarity.

Claims (7)

1. A centralized energy storage solar LED street lamp system, including multiple solar panels (1) and multiple LED street lamps (4), characterized in that multiple solar panels (1) pass through the first DC line ( 5) Connect the controller (2); multiple LED street lamps (4) are connected to the controller (2) through the first DC line (5); the controller (2) is connected to multiple lead-acids through the second DC line (6) battery pack (3). 2. A centralized energy storage solar LED street lamp system according to claim 1, characterized in that a plurality of solar panels (1) are connected in parallel to the controller (2). 3. A centralized energy storage solar LED street lamp system according to claim 1, characterized in that multiple LED street lamps (4) are connected to the controller (2) in parallel, and each LED street lamp (4) can work independently. 4. A centralized energy storage solar LED street lamp system according to claim 1, characterized in that the controller (2) and multiple lead-acid battery packs (3) are installed in the battery room (5). 5. A centralized energy storage type solar LED street lamp system according to claim 1, characterized in that a lead-acid battery pack (3) consists of two lead-acid battery units connected in series first, and then the two battery units connected in series Four groups are connected in parallel, and one lead-acid storage battery group (3) is used for energy storage and power supply of eight LED street lamps (4). 6. A centralized energy storage solar LED street lamp system according to claim 5, characterized in that one battery unit is a 12V, 200AH lead-acid battery. 7. A centralized energy storage solar LED street lamp system according to claim 1, 3 or 5, characterized in that each LED street lamp (4) is composed of a plurality of light-emitting diodes connected.