CN104333941A - Wind power and optical power complementation street lamp controller capable of monitoring, and control method thereof - Google Patents

Abstract

The invention discloses a monitorable wind-solar hybrid street lamp controller, comprising: a processor module, an auxiliary power supply module, a voltage and current detection module, an RS232 serial port communication module, a PWM drive circuit, an LED drive circuit, an unloading circuit, and a protection circuit. The processor module is connected with the Bluetooth control module through the RS232 serial port communication module, and the monitoring software of the smart phone realizes the monitoring of the status of the street lamp; at the same time, it is connected with the WIFI module, and realizes the unified monitoring and management of the street lamp through the communication between the WIFI module and the street lamp monitoring center. The invention also discloses a control method of a monitorable wind-solar complementary street lamp controller, which comprises the following steps: step 1, detecting the voltage of a fan; step 2, detecting the voltage of a storage battery; and step 3, detecting the state of the storage battery by using different charging methods. It has the advantages of good monitoring, easy management, reduced maintenance workload and reduced maintenance costs.

Description

A monitorable wind-solar complementary street lamp controller and its control method

technical field

The invention relates to the fields of solar power generation and wind power generation, in particular to a monitorable wind-solar complementary street lamp controller and a control method thereof.

Background technique

The utilization of renewable resources is an important way to develop a low-carbon economy. Wind energy and solar energy have the characteristics of no pollution and abundant resources, so they have been paid attention to. Wind-solar hybrid street lamps use wind energy and solar power generation technology to store the energy generated by the two in batteries to supply power to street lamps. At the same time, compared with high-pressure sodium lamps, LED street lamps have the advantages of low power consumption, long service life, and environmental protection. Therefore, using wind-solar hybrid LED street lamps to replace ordinary street lamps has become an important method for road lighting energy-saving renovation. There are some defects in the existing wind-solar hybrid street lamps: poor monitoring, unable to monitor the status of street lamps in real time, once a fault occurs, the workload of maintenance will be heavy; there is no communication interface, and unified monitoring and management of street lamps cannot be carried out; wind power photoelectric integrated control is adopted In this method, the electric energy output by the photovoltaic panel and the wind generator is connected to the storage battery after passing through the same DC/DC converter, which is prone to failure.

Contents of the invention

The primary purpose of the present invention is to overcome the problems of high failure rate, poor monitoring performance, and difficult maintenance of existing wind-solar hybrid street lamps, and provide a monitorable wind-solar hybrid street lamp controller. The controller is connected to a WIFI module through a single-chip microcomputer. The WIFI network realizes the communication between the street lamp and the monitoring center, and the street lamp management personnel can monitor the status of all the street lamps within the coverage of the WIFI network through the host computer of the monitoring center.

Another object of the present invention is to overcome the shortcomings and deficiencies of the prior art, and provide a control method for controlling a monitorable wind-solar hybrid street lamp controller. The control method realizes the conversion of RS232 data into wireless data transmission through the communication function of the Bluetooth control module , and monitor the relevant data of the wind-solar hybrid street lamp controller through the monitoring software of the smart phone. Once a fault occurs, it will alarm in time, which reduces maintenance costs and workload.

The primary purpose of the present invention can be achieved by the following technical solutions: a monitorable wind-solar complementary street lamp controller, including: a processor module, an auxiliary power supply module, a voltage and current detection module, an RS232 serial port communication module, a PWM drive circuit, an LED Drive circuit, unloading circuit, protection circuit. The auxiliary power supply module is connected to the processor module, and a single-ended flyback power supply is used to provide stable power supply for the control chip and each control circuit of the processor module; the voltage and current detection module is connected to the processor module to detect street lights The operating state of the system and the processor module collects voltage and current data to generate control signals, including the output voltage of the wind turbine, the output voltage of the photovoltaic panel, the battery voltage, the output current of the wind turbine and the output current of the photovoltaic panel. Detection; the processor module is connected with the WIFI module, and the communication between the street lamp and the monitoring center is realized through the WIFI network; the bluetooth control module is connected with the processor module through the RS232 serial communication module, and the bluetooth control module includes an I/O module and an MCU chip , DSP chip and RAM chip, the voltage and current detection circuit enters the detected voltage signal and current signal into the single chip microcomputer, after the signal is converted by AD, it enters the I/O interface of the Bluetooth control module through the RS232 serial communication module, and the signal is converted into The bluetooth wireless data is sent out, and at the same time, the smart phone adopts the monitoring software based on the Android system to receive the bluetooth wireless data, thereby realizing the voltage and current state monitoring function of the wind-solar hybrid street lamp through the monitoring software; the PWM drive circuit is connected with the processor module, It includes two PWM driving circuits, which are respectively used to drive two DC/DC converters of the wind power generation system and the solar power generation system. The PWM driving signal is generated by a single-chip microcomputer, and the generated PWM signal controls the conduction and switching of the MOS tube of the DC/DC converter. Turn off to charge the battery; the LED drive circuit is connected to the processor module, using a constant current drive chip and its peripheral circuit to drive the LED street lamp; the unloading circuit is connected to the processor module, when the fan is abnormal When the excess energy is released, the unloading circuit uses a PWM unloading circuit, and the voltage and current detection circuit detects the output voltage of the wind turbine. When the output voltage reaches the set point, the microcontroller generates a PWM signal to control the conduction and switching of the MOS tube. Turn off, so as to control the time when the high-power resistor is connected to the fan circuit. The high-power resistor has the function of consuming energy and can dissipate excess energy; the protection circuit is connected with the processor module, including battery overcharge and overdischarge protection circuit, battery reverse connection protection circuit, solar battery pack reverse connection protection circuit.

In the described controller for wind-solar complementary street lamps that can be monitored, the processor module includes a single-chip microcomputer and its minimum system, and the single-chip microcomputer adopts an ATmega8 chip.

In the monitorable wind-solar complementary street lamp controller, the auxiliary power module adopts a single-ended flyback power supply to provide stable power for the single-chip microcomputer and each control circuit.

In the described controller for wind-solar complementary street lamps that can be monitored, the voltage and current detection module includes a voltage detection circuit and a current detection circuit, which can monitor the output voltage of the wind power generator, the output voltage of the photovoltaic panel, the battery voltage, the wind power generation The output current of the machine and the output current of the photovoltaic panel are detected.

The described a kind of monitorable wind-solar complementary street lamp controller, described bluetooth control module comprises I/O module, MCU chip, DSP chip and RAM chip; wherein DSP chip adopts CC2540 of TI company, described LED drive circuit It consists of an LED driver chip and its peripheral circuits.

In the above-mentioned wind-solar hybrid street lamp controller that can be monitored, the unloading circuit adopts a PWM unloading circuit, and the PWM signal generated by the single-chip microcomputer is amplified by a push-pull circuit to drive a MOS tube, and a high-power resistor is connected in series with the MOS tube to play a role. Expenditure of excess energy.

In the monitorable wind-solar complementary street lamp controller, the protection circuit includes a battery overcharge and overdischarge protection circuit, a battery reverse connection protection circuit, and a solar cell group reverse connection protection circuit.

The monitorable wind-solar complementary street lamp controller also includes a smart phone and mobile phone monitoring software based on the Android platform, and sends the voltage and current data detected and processed by the processor module to the smart phone through the Bluetooth control module, and then monitors the The software monitors the status information of the wind-solar hybrid street lamp controller.

In the above-mentioned wind-solar complementary street lamp controller that can be monitored, the processor module is connected to the WIFI module, and the WIFI module communicates with the street lamp monitoring center through the WIFI network, and the voltage and current signals detected by the voltage and current detection circuit are processed by a single-chip microcomputer After that, it is sent to the monitoring center, and the monitoring center conducts unified management and monitoring of all street lights within the network coverage through the WIFI network.

Another object of the present invention can be achieved through the following technical solutions: a control method for controlling the monitorable wind-solar hybrid street lamp controller, comprising the following steps:

Step 1. Initialize the single-chip microcomputer, and detect the output voltage of the wind turbine. When the voltage value exceeds the unloading limit value, adjust the PWM duty cycle of the drive signal of the unloading circuit switch tube according to the value of the output voltage of the wind turbine. Start the unloading circuit;

Step 2: Detect the status of the battery. When it is detected that the voltage of the battery is overcharged or overdischarged, the overcharge and overdischarge protection circuit will be activated to cut off the load; if the battery is detected to be in the primary stage of charging, the MPPT current limiting charging method will be used. , MPPT is the maximum power tracking method, which makes the photovoltaic solar panel work at the maximum power point;

Step 3: Detect the status of the battery. When the capacity of the battery reaches 90%, use the constant voltage charging method, and at the same time detect the output voltage of the wind turbine, and judge whether it is necessary to start the unloading circuit according to the output voltage value. When it is detected that the charging current of the battery is less than 1/100C, the C is the capacity of the battery, indicating that the battery has been fully charged, and then enters the floating charge stage, even if the voltage across the battery remains at a fixed value.

In step 3, the battery state of the street lamp is detected through the bluetooth control module and smart phone monitoring software, and its specific detection method includes the following steps:

Step A, initialize the Bluetooth control module until the initialization process is completed, receive data, and judge whether the data is from the single-chip microcomputer of the processor module or from the Bluetooth control module; that is, it is judged that the voltage and current sampled by the voltage and current detection module are processed by the single-chip microcomputer The data is still the data written by the smartphone through the Bluetooth control module;

Step B. If the data comes from the serial port of the single-chip microcomputer, analyze the data, take out the valid data, and then pack it into Bluetooth data and send it to the smartphone; The valid data is then packaged into RS232 data and sent to the serial port of the microcontroller.

The beneficial effects of the present invention are: the existing wind-solar complementary street lamp controller is improved in the way of wind-power-photoelectric integrated control, and two PWM drive circuits are used to drive two-way DC/DC converters to separately control the wind power generation system and the solar power generation system, ensuring Stability and reliability of street lights. Send the collected voltage and current data to the smart phone through Bluetooth control, and monitor the status of the street lamp through the monitoring software of the smart phone; through the connection between the WIFI module and the processor module, the street lamp monitoring center communicates with the street lamp through the WIFI network, which is convenient for unification Management and monitoring, once a fault occurs, it will report to the police in time, which reduces maintenance costs and workload.

Description of drawings

The dotted line box in Fig. 1 is a structural block diagram of the monitorable wind-solar hybrid street lamp controller of the present invention.

Fig. 2 is a control flow chart of the monitorable wind-solar hybrid street lamp controller of the present invention.

Fig. 3 is a control flow chart of the Bluetooth control module of the monitorable wind-solar hybrid street lamp controller of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

Example

As shown in Figure 1, a monitorable wind-solar hybrid street lamp controller includes: processor module 1, auxiliary power supply module 2, voltage and current detection module 3, RS232 serial port communication module 8, PWM drive circuit 5, LED drive circuit 4 , unloading circuit 6, protection circuit 7. Described processor module 1 adopts Atmega8 single-chip microcomputer as the control chip to form the minimum system of single-chip microcomputer, and described processor module 1 is connected with WIFI module, realizes the communication of street lamp and monitoring center through WIFI network. The auxiliary power supply module 2 is connected with the processor module 1, adopts UC3844 chip as the main control chip to form a single-ended flyback power supply, and provides stable power supply for the control chip of the processor module and each control circuit. The voltage and current detection module 3 is connected to the processor module 1, and is used to detect the running state of the street lamp and collect voltage and current data through the processor module 1 to generate a control signal. The voltage and current detection module 3 includes the output voltage of the wind generator, The output voltage of the photovoltaic panel, the battery voltage, the output current of the wind generator and the output current of the photovoltaic panel are detected; among them, the voltage detection circuit adopts the Hall voltage sensor to collect the voltage, and the output terminal of the Hall voltage sensor is connected to the power ground. A sampling resistor is connected between them, and the voltage signal obtained through the sampling resistor passes through the voltage follower, and then enters the AD conversion interface of the single-chip microcomputer for AD conversion after being divided by two resistors; the current detection circuit adopts the Hall current sensor to collect the current. Connect a sampling resistor between the Hall current sensor and the power supply ground, convert the current passing through the Hall current sensor into a voltage signal, and perform impedance transformation through the voltage follower. The voltage signal output by the voltage follower is divided by two resistors and enters the The AD conversion interface of the single-chip microcomputer performs AD conversion. Described bluetooth control module 9 is connected with processor module 1 by RS232 serial port communication module 8, bluetooth control module 9 comprises I/O module, MCU chip, DSP chip and RAM chip, wherein DSP chip adopts CC2540 of TI company, voltage and current detection The electrical module 3 enters the detected voltage signal and current signal into the single-chip microcomputer for AD conversion, and enters the I/O interface of the Bluetooth control module 9 through the RS232 serial communication module 8, and the signal is converted into Bluetooth wireless data by the Bluetooth control module 9 and sent out. , the smart phone adopts the smart phone monitoring software based on the Android system, receives the Bluetooth wireless data sent by the Bluetooth control module 9, and realizes the voltage and current state monitoring function of the wind-solar hybrid street lamp through the monitoring software; the smart phone monitoring software based on the Android system includes the following Two aspects of functions: 1: Collect and display the output voltage and current of photovoltaic solar panels and wind generators, terminal voltage and current data of batteries through the Bluetooth control module 9 and monitoring software; 2: Voltage and current detection module 3 The data collected and sent to the smart phone by the bluetooth control module 9 is analyzed to determine whether the state of the current street lamp is abnormal, and an alarm signal will be generated in case of an abnormality. The PWM driving circuit 5 is connected to the processor module 1, and includes two PWM driving circuits, which are respectively used to drive two DC/DC converters of the wind power generation system and the solar power generation system. The driving circuit adopts a transformer coupling driver, and the primary side of the transformer is Diodes and capacitors are used to form a reset circuit to prevent magnetic core saturation. The level of the PWM signal generated by the microcontroller leads to different polarities of the voltage on the primary side of the transformer, thereby controlling the on and off of the main switch tube on the secondary side of the transformer. The LED driving circuit 4 is connected with the processor module 1, and the LED street lamp is driven by an LT3791 driving controller. The unloading circuit 6 is connected to the processor module 1, and when an abnormal situation occurs in the fan, the excess energy is released. The unloading circuit 6 adopts a PWM unloading circuit, and the electricity output by the wind generator is converted into It is direct current, connected with MOS tube and high-power resistor, the voltage and current detection module 3 detects the rectified output voltage of the wind power generator, when the output voltage reaches the set point, the single-chip microcomputer generates a PWM signal to control the conduction and shutdown of the MOS tube In order to control the time when the high-power resistance is connected to the fan circuit, the high-power resistance has the function of consuming energy, thereby dissipating excess energy; the protection circuit 7 is connected to the processor module 1, including battery overcharge and over-discharge Protection circuit, battery reverse connection protection circuit, solar battery pack reverse connection protection circuit.

As shown in Figure 2, it is a control method for controlling the monitorable wind-solar hybrid street lamp controller of the present invention, including the following steps:

Step 1. Initialize the single-chip microcomputer and detect the output voltage of the wind turbine. When the voltage exceeds the unloading limit value, adjust the PWM duty cycle of the drive signal of the switch tube of the unloading circuit according to the value of the output voltage of the wind turbine, and start unloading circuit;

Step 2: Detect the status of the battery. When it is detected that the voltage of the battery is overcharged or overdischarged, the overcharge and overdischarge protection circuit will be activated to cut off the load; if the battery is detected to be in the primary stage of charging, the MPPT current limiting charging method will be used. , MPPT is the maximum power tracking method, which makes the photovoltaic solar panel work at the maximum power point;

Step 3: Detect the status of the battery. When the capacity of the battery reaches 90%, use the constant voltage charging method, and at the same time detect the output voltage of the wind turbine, and judge whether it is necessary to start the unloading circuit according to the output voltage value. When it is detected that the charging current of the battery is less than 1/100C, the C is the capacity of the battery, indicating that the battery has been fully charged, and then enters the floating charge stage, even if the voltage across the battery remains at a fixed value.

As shown in Figure 3, in step three, the state of the street lamp battery is monitored through the Bluetooth control module and the smart phone monitoring software, and the specific monitoring method includes the following steps:

Step A, initialize the Bluetooth control module until the initialization process is completed, receive data, and judge whether the data is from the single-chip microcomputer of the processor module or from the Bluetooth control module; that is, it is judged that the voltage and current sampled by the voltage and current detection module are processed by the single-chip microcomputer The data is still the data written by the smartphone through the Bluetooth control module;

Step B. If the data comes from the serial port of the single-chip microcomputer, analyze the data, take out the valid data, and then pack it into Bluetooth data and send it to the smartphone; The valid data is then packaged into RS232 data and sent to the serial port of the microcontroller.

The above-mentioned embodiment is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited by the above-mentioned embodiment, and any other changes, modifications, substitutions, combinations, Simplifications should be equivalent replacement methods, and all are included in the protection scope of the present invention.

Claims (10)

1. A monitorable wind-solar hybrid street lamp controller, characterized in that it includes a processor module, an auxiliary power supply module, a voltage and current detection module, an RS232 serial port communication module, a PWM drive circuit, an LED drive circuit, an unloading circuit and a protection circuit ; The auxiliary power supply module, voltage and current detection module, LED drive circuit, unloading circuit, and protection circuit are respectively connected to the processor module; the processor module is connected to the Bluetooth control module through the RS232 serial port communication module, and is connected to the WIFI module at the same time The PWM drive circuit is connected to the processor module, the PWM drive circuit includes a first PWM drive circuit and a second PWM drive circuit, the first PWM drive circuit is used to drive the DC/DC converter of the wind power generation system, The second PWM drive circuit is used to drive the DC/DC converter of the solar power generation system. 2. The monitorable wind-solar hybrid street lamp controller according to claim 1, wherein the processor module includes a single-chip microcomputer and its minimum system, and the single-chip microcomputer adopts an ATmega8 chip. 3. The monitorable wind-solar hybrid street lamp controller according to claim 1, wherein the auxiliary power module adopts a single-ended flyback power supply to provide a stable power supply for the single-chip microcomputer and each control circuit. 4. The monitorable wind-solar hybrid street lamp controller according to claim 1, characterized in that: the voltage and current detection module includes a voltage monitoring circuit and a current detection circuit, which are used to monitor the output voltage of the wind generator, the photovoltaic cell The output voltage of the panel, the battery voltage, the output current of the wind generator and the output current of the photovoltaic panel are detected. 5. The monitorable wind-solar complementary street lamp controller according to claim 1, characterized in that: the bluetooth control module includes an I/O module, an MCU chip, a DSP chip and a RAM chip; CC2540, the LED driving circuit includes an LED driving chip and its peripheral circuits. 6. The monitorable wind-solar complementary street lamp controller according to claim 1, characterized in that: the unloading circuit uses a PWM unloading circuit; the PWM signal generated by the single-chip microcomputer is amplified by a push-pull circuit to drive a MOS tube, and the MOS tube In series with the high power resistor, the high power resistor is used to dissipate energy. 7. The monitorable wind-solar hybrid street lamp controller according to claim 1, wherein the protection circuit includes a battery overcharge and overdischarge protection circuit, a battery reverse connection protection circuit, and a solar battery pack reverse connection protection circuit; The WIFI module includes a WIFI chip and its interface circuit, and the WIFI module communicates with the monitoring center through a WIFI network. 8. The monitorable wind-solar hybrid street lamp controller according to claim 1, characterized in that: it also includes a smart phone and mobile phone monitoring software based on the Android platform, and the voltage and current data after the processor module is detected and processed by the Bluetooth control module Send it to the smart phone, and then monitor the status information of the wind-solar hybrid street lamp controller through the monitoring software. 9. A control method for controlling the monitorable wind-solar hybrid street lamp controller according to claim 1, characterized in that it comprises the following steps: Step 1. Initialize the single-chip microcomputer, and detect the output voltage of the wind turbine. When the voltage value exceeds the unloading limit value, adjust the PWM duty cycle of the drive signal of the unloading circuit switch tube according to the value of the output voltage of the wind turbine. Start the unloading circuit; Step 2: Detect the status of the battery. When it is detected that the voltage of the battery is overcharged or overdischarged, the overcharge and overdischarge protection circuit will be activated to cut off the load; if the battery is detected to be in the primary stage of charging, the MPPT current limiting charging method will be used. , MPPT is the maximum power tracking control method, so that the photovoltaic solar panel works at the maximum power point; Step 3: Detect the status of the battery. When the capacity of the battery reaches 90%, use the constant voltage charging method, and at the same time detect the output voltage of the wind turbine, and judge whether it is necessary to start the unloading circuit according to the output voltage value. When it is detected that the charging current of the battery is less than 1/100C, the C is the capacity of the battery, indicating that the battery has been fully charged, and then enters the floating charge stage, even if the voltage across the battery remains at a fixed value. 10. The control method according to claim 9, characterized in that, in step 3, the state of the storage battery of the street lamp is monitored through the Bluetooth control module and the smart phone monitoring software, and its specific monitoring method includes the following steps: Step A, initialize the Bluetooth control module until the initialization process is completed, receive data, and judge whether the data is from the single-chip microcomputer of the processor module or from the Bluetooth control module; that is, it is judged that the voltage and current sampled by the voltage and current detection module are processed by the single-chip microcomputer The data is still the data written by the smartphone through the Bluetooth control module; Step B. If the data comes from the serial port of the single-chip microcomputer, analyze the data, take out the valid data, and then pack it into Bluetooth data and send it to the smartphone; The valid data is then packaged into RS232 data and sent to the serial port of the microcontroller.