CN210157446U - Solar street lamp switch control device based on MPPT - Google Patents
Solar street lamp switch control device based on MPPT Download PDFInfo
- Publication number
- CN210157446U CN210157446U CN201920618542.3U CN201920618542U CN210157446U CN 210157446 U CN210157446 U CN 210157446U CN 201920618542 U CN201920618542 U CN 201920618542U CN 210157446 U CN210157446 U CN 210157446U
- Authority
- CN
- China
- Prior art keywords
- street lamp
- mppt
- photovoltaic cell
- control device
- solar street
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model relates to a solar street lamp switch control device based on MPPT, which comprises a photovoltaic cell, a DC/DC converter, a storage battery and a switch controller which are connected in sequence, wherein the switch controller is connected with a street lamp; the device also comprises a digital signal processor adopting the MPPT control method, wherein the digital signal processor is connected with the photovoltaic cell through a voltage and current acquisition module, connected with the DC/DC converter through a driving circuit and connected with the switch controller. Compared with the prior art, the utility model discloses except that utilizing solar cell to pass through DC/DC converting circuit and MPPT control technique to store solar energy in the battery and supply power to the street lamp, utilize maximum power point tracking's characteristic simultaneously, replace street lamp timing switch and light sensor's function, realize street lamp intelligence on-off control.
Description
Technical Field
The utility model belongs to the technical field of lighting apparatus control technique and specifically relates to a solar street lamp on-off control device based on MPPT is related to.
Background
Crystalline silicon cells in the existing solar cells occupy a large market share, in practical application, under the condition that outdoor temperature and radiation illumination cannot be changed and photovoltaic cells cannot be replaced, the capacity of the photovoltaic cells needs to be fully exerted, light energy is converted into electric energy as much as possible, Power generation cost is reduced, and an important mode for solving the problem is to adopt Maximum Power Point Tracking (MPPT) technology. At present, the solar cell is widely applied to power supply of street lamps, and maximum power point tracking is already realized, so that light energy is converted into electric energy as much as possible. Besides enabling the maximum charging power of the solar cell, the MPPT controller also contains more information that can be utilized.
At present, most of the related street lamp control utilizes the characteristics of a photosensitive resistor, transmits different signals to a singlechip according to different light intensities, then combines a sound sensor, an infrared photoelectric sensor and an infrared human body recognition sensor to transmit detected information to the singlechip, and gives signals for the on and off of the street lamp through related operation processing in the singlechip, and a small part of the street lamp control utilizes a timing switch. The former control is comparatively complicated among these two kinds of control methods, and the cost is higher, and the latter is for not only spending manpower and materials, but also does not guarantee operating personnel's safety though simple.
The solar street lamp has the advantages that the charging characteristics of the photovoltaic cell panel are fully utilized, a solution idea is provided for timely switching on and off of the solar street lamp according to the illumination intensity, and the solar street lamp has important significance in the aspects of humanization, intellectualization, effective energy conservation, cost reduction and the like of street lamp illumination. At present, the control mode aiming at the solar street lamp switch comprises a timing switch mode and a light ray sensor control switch mode, and a case of fully considering and utilizing the charging characteristic of a photovoltaic cell panel to realize intelligent control of the switch is not provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a solar street lamp on-off control device based on MPPT in order to overcome the defect that above-mentioned prior art exists.
The purpose of the utility model can be realized through the following technical scheme:
a solar street lamp switch control device based on MPPT comprises a photovoltaic cell, a DC/DC converter, a storage battery and a switch controller which are connected in sequence, wherein the switch controller is connected with a street lamp; the device also comprises a digital signal processor adopting the MPPT control method, wherein the digital signal processor is connected with the photovoltaic cell through a voltage and current acquisition module, connected with the DC/DC converter through a driving circuit and connected with the switch controller.
Preferably, the photovoltaic cell is a polycrystalline silicon solar cell panel assembly.
Preferably, the DC/DC converter includes an N-channel MOS field effect transistor.
Preferably, the voltage and current acquisition module comprises a hall voltage sensor and a hall current sensor.
Preferably, the switch controller comprises a relay switch.
Preferably, the device also comprises a display screen and a key connected with the digital signal processor.
Preferably, the system further comprises a GPS module connected with the digital signal processor.
Compared with the prior art, the utility model discloses except that utilize solar cell to store solar energy in the battery through DC/DC converting circuit and MPPT control technique and supply power to the street lamp, the function of street lamp time switch and optical line sensors is replaced according to sunrise sunset moment to the characteristic of usable maximum power point tracking or according to sunrise, realizes street lamp intelligence on-off control, has improved the too early or too late problem of traditional street lamp time switch, has also practiced thrift the cost to a certain extent simultaneously; the solar street lamp has the advantages that the charging characteristics of the photovoltaic cell panel are fully utilized, a solution idea is provided for timely switching on and off of the solar street lamp according to the illumination intensity, and the solar street lamp has important significance in the aspects of humanization, intellectualization, effective energy conservation, cost reduction and the like of street lamp illumination.
Drawings
Fig. 1 is a schematic structural view of the street lamp switch control device of the present invention;
FIG. 2 is a block diagram of a switch controller;
FIG. 3 is an I-V characteristic curve under different illumination intensities;
FIG. 4 is a P-V characteristic curve under different illumination intensities;
FIG. 5 is a photovoltaic panel circuit equivalent model;
FIG. 6 is a block diagram of the street lamp switch control strategy of the present invention;
FIG. 7 is a graph of maximum power versus illumination intensity;
FIG. 8 is a partial enlarged view of a curve of maximum power with illumination intensity;
FIG. 9 is a flow chart of the switch control process of the present invention;
fig. 10 is a flow chart of the opening process of the street lamp in the present invention;
fig. 11 is a flow chart of the closing process of the middle street lamp of the present invention;
fig. 12 is a flowchart of the data updating process of the present invention.
The figure is marked with: 1. the system comprises a photovoltaic cell, a DC/DC converter, a storage battery, a switch controller, a street lamp, a digital signal processor, a voltage and current acquisition module, a driving circuit, a key, a display screen, a GPS module and a voltage and current acquisition module, wherein the photovoltaic cell 2, the DC/DC converter 3, the storage battery 4, the switch controller 5, the street lamp 6, the digital signal processor 7, the voltage and current acquisition module 8, the driving.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
Examples
As shown in fig. 1, the present application provides an MPPT-based solar street lamp switch control device, which includes a photovoltaic cell 1, a DC/DC converter 2, a storage battery 3, and a switch controller 4, which are connected in sequence, where the switch controller 4 is connected to a street lamp 5. The device also comprises a digital signal processor 6(DSP), wherein the digital signal processor 6 is connected with the photovoltaic cell 1 through a voltage and current acquisition module 7, connected with the DC/DC converter 2 through a driving circuit 8 and connected with the switch controller 4. The digital signal processor 6 adopts an MPPT control method, obtains the maximum power by collecting the voltage and the current of the photovoltaic cell 1, and controls the switch controller 4 by comparing the maximum power with the set threshold value.
The photovoltaic cell 1 is a polycrystalline silicon solar panel assembly and adopts the model of HT60-156P-4 BB-265. The DC/DC converter 2 includes an N-channel MOS field effect transistor, specifically a 25N60 MOSFET. The storage battery 3 adopts a 24V lithium battery. The voltage and current acquisition module 7 comprises a Hall voltage sensor with the model LEM-LV25-P and a Hall current sensor with the model LEM-LA 25-NP. The switch controller 4 comprises a relay switch which is configured as shown in fig. 2, and the DSP gives a high-low level control signal to control the switch of the relay JK, so as to control the on and off of the street lamp 5. The digital signal processor 6 comprises a DSP main control chip and a peripheral circuit which is connected with the DSP main control chip, wherein the peripheral circuit comprises a program memory, a data memory, an input interface, an output interface, an A/D conversion module, a D/A conversion module, a UART interface and the like, and the digital signal processor 6 can also be connected with a display screen 10 and a key 9.
The sunrise time and the sunset time in the device can be obtained by calculating the longitude and latitude and the date, the longitude and latitude information is obtained by connecting a GPS module 11 of the digital signal processor 6, and the street lamp can be controlled to be turned off and turned on at the sunrise time and the sunset time.
In the street lamp switch control system, the photovoltaic cell 1 converts light energy into electric energy, the output voltage passes through the Boost booster circuit to obtain higher direct current bus voltage, and the electric energy is stored in the storage battery 3. The DSP main control chip can collect the voltage and current output by the photovoltaic cell 1 and output PWM to control the Boost circuit, so that the photovoltaic cell 1 works at the maximum power point, and the maximum power is compared with a set value, so that a signal is output to control the charging and discharging of the storage battery 3.
The device can also utilize the characteristic that the maximum power point can change along with the change of the illumination intensity, and when the maximum power is lower than a certain value, the illumination intensity is also lower than the certain value, and then the street lamp 5 can be started by utilizing the street lamp control device. The control device for realizing intelligent switch of the street lamp 5 by utilizing the charging characteristic of the photovoltaic cell 1 fills up the blank of intelligent control of the street lamp in China.
In a solar photovoltaic panel power generation system, external environmental factors such as illumination intensity, temperature and carried load affect the photovoltaic cell 1, so that a nonlinear relationship is presented between output voltage and current of the photovoltaic cell, uncertainty of a photovoltaic grid-connected system is increased, and power generation efficiency of the photovoltaic cell 1 is reduced. For the above reasons, the output power of the photovoltaic cell 1 needs to be adjusted in real time, so that the maximum power output, that is, Maximum Power Point Tracking (MPPT), can be achieved in any external environment. The I-V, P-V characteristic curves of the photovoltaic cell 1, in which the current-voltage characteristic is affected by the intensity of light, are shown in fig. 3 and 4, respectively.
The MPPT algorithm of the device adopts a conductance increment method control strategy. The principle of the conductance incremental method is as follows: from the relationship between the output voltage and the output power of the photovoltaic cell 1, the following judgment conditions can be known:
when the operating point is at the maximum power point
When the working point is at the right side of the maximum power point
When the operating point is to the left of the maximum power point, there is
The output power of the photovoltaic cell 1 is:
P＝UI
the two sides of the above formula are derived from U
When the photovoltaic cell 1 operates at the maximum power point, there are
We can get
The circuit equivalent model of the photovoltaic cell 1 is shown in fig. 5, where U and I can be derived from the voltage-current relation of the photovoltaic cell 1 from fig. 5:
I＝Iph-ID-I3(3-3)
UD＝U+IR1(3-6)
ideally R1About zero, R3It can be regarded as infinite, and at this time, the above formula can be simplified as follows:
the output power of the photovoltaic cell 1 is:
wherein, IphProduced by illumination of the interior of the photovoltaic cell 1The generated current; i is output current; i isDThe dark current in the photovoltaic cell 1 can reflect that the total diffusion current generated by the P-N junction of the photovoltaic cell is influenced by the current environmental temperature change; r1Is the equivalent resistance of the photovoltaic cell 1; r2An external load resistor of the photovoltaic cell 1; r3Is the bypass resistance of the photovoltaic cell 1; u shapeDIs the terminal voltage of the equivalent diode; u is the open circuit voltage of the photovoltaic cell 1. I isoFor reverse saturation current, IscThe short-circuit current of the photovoltaic cell 1 is represented by q, the electronic charge, K, the Boltzmann constant, T, the absolute temperature, and A, the P-N junction curve constant.
As shown in fig. 6, the principle of the MPPT algorithm is that the result of the control algorithm in the MPPT controller is transmitted to the PI controller, so as to generate a duty ratio D that changes constantly, and the change of the duty ratio can change the output voltage and the output current of the solar battery, and at this time, the photovoltaic battery 1 searches the position of the maximum power point according to the MPPT strategy, so that the photovoltaic battery works at the maximum power point all the time. The output voltage and the output current of the photovoltaic cell 1 are detected by the sensors, and the generated power of the photovoltaic cell is calculated for comparison with a set value.
The illumination intensity varies with time during a day, and the maximum power output by the photovoltaic cell 1 also varies with the illumination intensity. The street lamp control method utilizes the characteristic that the maximum power point can change along with the change of the illumination intensity, and when the maximum power is lower than a certain value, the illumination intensity is also lower than the certain value, and then the street lamp 5 can be turned on by utilizing the street lamp control device.
As can be seen from fig. 7 and 8, the maximum power actually changes with the change of the illumination intensity, and the horizontal line in fig. 8 is the power set value, i.e., the switching threshold, of the present application, and when the illumination intensity is within the acceptable range, the maximum power is also greater than the power set value, thereby controlling the street lamp 5 to be turned off.
As shown in fig. 9, in this embodiment, the method for controlling the street lamp switch control device to switch with the maximum power point includes:
s1, initialization: recording the sunset time T1 and the sunrise time T2 of each day in one week to obtain the average sunset time
And average sunrise time
Importing the data into a data memory;
s2, monitoring the state of the street lamp 5: when the current state of the street lamp 5 is monitored to be off, the street lamp 5 is controlled to be turned on in the step S3, otherwise, the street lamp 5 is controlled to be turned off in the step S4;
s3, starting control of the street lamp 5: as shown in fig. 10, at the average sunset time
Continuously detecting the maximum power of the photovoltaic cell 1 in the previous 30 minutes, starting timing when the maximum power is smaller than a switching threshold value, detecting every 2 minutes, continuously monitoring for 5 times, re-timing if the maximum power is larger than the switching threshold value during timing, recording the timing end time as the starting time t1 of the street lamp 5 if the maximum power for 5 continuous times during timing is smaller than the switching threshold value, and controlling the street lamp 5 to be started;
s4, street lamp 5 closing control: as shown in fig. 11, it is continuously determined whether the maximum power of the photovoltaic cell 1 is greater than the switching threshold value within 30 minutes before and after the average sunrise time, if so, the time is recorded as a street lamp 5 closing time t2, and the street lamp 5 is controlled to be closed, and if the maximum powers detected in the period are less than the switching threshold value, it is determined as special weather, and the street lamp 5 is controlled to be closed;
s4, data update, as shown in fig. 12:
updating the sunset time data according to the opening time of the street lamp 5 on the day, and calculating
If | δ 1| < ε 1, then t1 is updated as the new sunset time to the data storage, and the average sunset time is recalculated
If | δ 1| ≧ epsilon 1,the data of the data memory is not changed, wherein epsilon 1 is a first setting error;
updating the sunrise time data according to the closing time of the street lamp 5 on the day, and calculating
If | δ 2| < ε 2, then t2 is updated into the data store as the new sunrise time and the average sunrise time is recalculated
If | delta 2| ≧ epsilon 2, the database data is unchanged, where epsilon 2 is the second set error.
Due to the shortage of electric power energy, the research on new energy power generation is being carried out at home and abroad, wherein the solar power generation technology tends to be mature. Through the implementation of this application, can further utilize solar power generation technology to provide brand-new, low-cost technical solution for solar street lamp's intelligence switch, thereby can effectively the energy saving can adopt the purpose that the cost is practiced thrift to the less capacity battery even, bring very showing society and economic benefits.
Claims (7)
1. A solar street lamp switch control device based on MPPT is characterized by comprising a photovoltaic cell, a DC/DC converter, a storage battery and a switch controller which are connected in sequence, wherein the switch controller is connected with a street lamp; the device also comprises a digital signal processor adopting the MPPT control method, wherein the digital signal processor is connected with the photovoltaic cell through a voltage and current acquisition module, connected with the DC/DC converter through a driving circuit and connected with the switch controller.
2. The MPPT-based solar street light switch control device according to claim 1, wherein the photovoltaic cell is a polycrystalline silicon solar panel assembly.
3. The MPPT-based solar street lamp switching control device of claim 1, wherein the DC/DC converter comprises an N-channel MOS field effect transistor.
4. The MPPT-based solar street lamp switching control device according to claim 1, wherein the voltage and current collection module comprises a hall voltage sensor and a hall current sensor.
5. The MPPT-based solar street light switch control of claim 1, wherein the switch controller comprises a relay switch.
6. The MPPT-based solar street light switch control device according to claim 1, further comprising a display screen and a key connected to the digital signal processor.
7. The MPPT-based solar street light switch control device according to claim 1, further comprising a GPS module connected to the digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920618542.3U CN210157446U (en) | 2019-04-30 | 2019-04-30 | Solar street lamp switch control device based on MPPT |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920618542.3U CN210157446U (en) | 2019-04-30 | 2019-04-30 | Solar street lamp switch control device based on MPPT |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210157446U true CN210157446U (en) | 2020-03-17 |
Family
ID=69758252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920618542.3U Active CN210157446U (en) | 2019-04-30 | 2019-04-30 | Solar street lamp switch control device based on MPPT |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210157446U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035591A (en) * | 2019-04-30 | 2019-07-19 | 上海电力学院 | A kind of solar street light switch controlling device and method based on MPPT |
-
2019
- 2019-04-30 CN CN201920618542.3U patent/CN210157446U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110035591A (en) * | 2019-04-30 | 2019-07-19 | 上海电力学院 | A kind of solar street light switch controlling device and method based on MPPT |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101783621B (en) | Global maximum power point tracking method of photovoltaic generating system and system device | |
| CN102056380B (en) | Distributed synchronization solar energy street lamp control system | |
| CN104426473A (en) | Solar photovoltaic system control method and device | |
| CN201690377U (en) | Global maximum power point tracking device of photovoltaic power generation system | |
| CN210839049U (en) | Intelligent photovoltaic power supply system adaptive to extreme illumination conditions | |
| CN202444652U (en) | Solar luminaire controller | |
| CN101969717A (en) | Full-effect full-automatic solar street lamp control system | |
| CN201297559Y (en) | Solar energy controller | |
| CN210157446U (en) | Solar street lamp switch control device based on MPPT | |
| Shivaleelavathi et al. | Solar based smart street lighting system | |
| CN206164930U (en) | Solar street lamp's intelligent light control device | |
| CN103024993A (en) | Energy-saving outdoor illumination controlling system and controlling method | |
| CN210867256U (en) | Energy-saving power supply system integrating solar panel, commercial power and storage battery | |
| CN204986823U (en) | High effective solar street light | |
| CN109542129B (en) | Solar photovoltaic two-dimensional automatic tracking control system | |
| CN203261530U (en) | Light modulation color modulation type LED solar energy street lamp controller | |
| CN202738220U (en) | Intelligent solar LED street lamp controller | |
| Ling et al. | Development of photovoltaic hybrid LED street lighting system | |
| CN107276205B (en) | Weak light charging system and solar charging system | |
| CN115315039A (en) | Solar-powered municipal street lamp and control method thereof | |
| TWI460979B (en) | Control method of a dc-dc converter and a voltage coverting system | |
| CN204836698U (en) | Solar street lamp control system based on infrared induction | |
| CN104470146B (en) | A kind of self adaptation long-life sampling solar street lamp controller | |
| CN203689703U (en) | Intelligent adaptive solar traffic light | |
| CN210725435U (en) | PID solar street lamp controller based on incremental algorithm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |