CN110190665A - Greenhouse wind and solar hybrid power generation system and control method - Google Patents

Abstract

The invention discloses a wind-solar complementary power generation system for greenhouses and a control method thereof. The system includes a PLC controller, power generation equipment respectively connected to the PLC controller, a storage battery, sensing equipment, and greenhouse electrical equipment; the power generation equipment includes wind power The generator and the photovoltaic power generation assembly control the output through the wind controller and the photovoltaic controller respectively; the power generation equipment and the storage battery are connected in parallel, and the power supply for the greenhouse electrical equipment is supplied through the inverter; the sensing equipment includes an illuminance sensor and a wind speed sensor; The greenhouse electrical equipment includes lighting equipment, wet curtain water pump motor, fan and sunshade net motor. The system also includes a host computer configured with configuration software, which is convenient for intelligent regulation of power generation in large-scale greenhouses, and provides a system control method. The invention integrates the load with the power generation system, and the system can adjust the power generation at any time according to the power demand of the load, meeting the requirements of intelligence and modernization.

Description

Greenhouse wind and solar hybrid power generation system and control method

technical field

The invention relates to a wind-solar hybrid power generation system, in particular to a wind-solar hybrid power generation system for a greenhouse and a control method.

Background technique

The utilization of new energy has become one of the main directions of human development today. Wind-solar hybrid power generation, as a new energy power generation method, has been more and more widely used, such as wind-solar hybrid street lights, wind-solar hybrid communication base stations, wind-solar hybrid weather Stand and wait. Greenhouses in some areas of our country have already applied solar power generation, but there are still some problems. For example, there will be continuous cloudy and rainy weather in the Yangtze River Delta region, which will lead to insufficient solar power generation, which will easily cause battery over-discharge, damage the battery and insufficient power supply, requiring grid power supply. This is especially true in winter and spring. However, when the weather is bad, it is often accompanied by strong winds. For this situation, the wind-solar hybrid power generation system can be used to replace the traditional solar power generation system, so that the greenhouse can be separated from the grid power supply and become a self-sufficient independent power generation and consumption system. Especially suitable for convenient farmland.

Contents of the invention

Purpose of the invention: In view of the above problems, the present invention proposes a wind-solar hybrid power generation system and control method for greenhouses, which can realize wind-solar hybrid power supply for greenhouse loads, and can automatically switch on or cut off power generation equipment according to power consumption conditions to realize intelligent regulation.

Technical solution: The technical solution adopted in the present invention is a wind-solar hybrid power generation system for greenhouses, which includes PLC controllers, power generation equipment connected to the PLC controllers, batteries, sensing equipment, and greenhouse electrical equipment; The power generation equipment includes wind power generators and photovoltaic power generation components, and the output is controlled by the wind power controller and the photovoltaic controller respectively; the power generation equipment is connected in parallel with the storage battery, and supplies power to the greenhouse electrical equipment through the inverter; the sensing equipment includes light intensity sensors and a wind speed sensor; the greenhouse electrical equipment includes lighting equipment, wet curtain water pump motors, fans and sunshade net motors.

Further, the illuminance sensor and the wind speed sensor are connected to the PLC controller through an analog input module.

Further, the wet curtain water pump motor is connected with a water pump for spraying water to increase humidity in the greenhouse. The lighting equipment is arranged on the roof of the greenhouse, and the motor of the sunshade net is connected with the sunshade net arranged outside the roof of the greenhouse.

In another solution, the system also includes a host computer configured with configuration software, the host computer is connected to the PLC controller, and reads and writes the PLC controller through the configuration software.

The present invention also provides a control method for wind-solar hybrid power generation for greenhouses, comprising the following steps:

(1) First determine whether there is any electricity demand for electrical equipment. If so, the system judges the weather conditions at the time based on the illuminance sensor and the wind speed sensor, and prioritizes the light conditions. Use photovoltaic power generation when the light conditions are met, and the sunshine conditions do not meet the electricity requirements. Use wind power when needed.

(2) On the basis of step (1), judge whether the power generation meets the power consumption. If so, directly choose to use photovoltaic modules or wind turbines to supply power to the equipment, or both to supply power together. If it is not satisfied, the wind, light and storage battery will be used to supply power to the equipment.

(3) On the basis of step (1), if the wind speed is very small and there is no sunshine on that day, it is judged whether the battery power is sufficient for power consumption. If it is satisfied, the battery will supply power; if not, the system will alarm;

(4) If there is no electrical equipment in the greenhouse, the system chooses whether to use wind power to charge the battery according to the power of the battery.

Beneficial effects: Compared with the existing wind-solar hybrid technology, the invention integrates the load and the power generation system, and the system can adjust the power generation at any time according to the power demand of the load, which meets the requirements of intelligence. The invention has strong mobility, does not need to lay additional electric wires, and satisfies the convenience of laying well. The invention aims at the requirements of agricultural modernization and intelligence, and makes the power generation of the greenhouse more flexible and cleaner.

Description of drawings

Fig. 1 is a structural diagram of the present invention;

Fig. 2 is a system block diagram of the power generation system of the present invention;

Fig. 3 is a system wiring diagram of the power generation system of the present invention;

Fig. 4 is a flow chart of the control method of the present invention.

Detailed ways

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

The wind-solar hybrid power generation system for greenhouses according to the present invention has an overall structure as shown in Figure 1, a wind generator 1 and a photovoltaic power generation module 2 are arranged outside the greenhouse, and a series of electrical equipment for adjusting the temperature and humidity inside the greenhouse are arranged in the greenhouse, including Lighting equipment 3, wet curtain water pump 6, fan 5 and sunshade net 4. The electric motor of wet curtain water pump 6 links to each other with water pump, and the wet curtain water pump motor sprays water pump to high place on the wet curtain, is used for cooling, and can also improve the humidity in the greenhouse. The lighting equipment 3 is arranged on the roof of the greenhouse, and increasing the lighting under certain humidity conditions can increase the temperature and humidity. The motor of the sunshade net is connected with the sunshade net 4 arranged on the outside of the greenhouse roof. When the temperature is too high, pulling the sunshade net can effectively reduce the temperature of the ceiling; in addition, the fan 5 installed on the greenhouse wall can also enhance the air circulation in the greenhouse and reduce the temperature. temperature and humidity. The system block diagram of the power generation system is shown in Figure 2. The invention adopts PLC controller and configuration software control to realize wind-solar complementary power generation. The system is mainly composed of PLC controller, wind power generator, photovoltaic power generation components, wind power controller, photovoltaic controller, storage battery, inverter and greenhouse electrical equipment . The wind turbine converts wind energy into electrical energy, rectifies and converts DC through the wind controller, and obtains a standard DC voltage to charge the battery, or supplies power to the greenhouse electrical equipment through the inverter. The photovoltaic power generation module converts solar energy into electrical energy, and performs DC conversion through the photovoltaic controller, and also obtains standard DC voltage to charge the battery, or supplies power to the greenhouse electrical equipment through the inverter. Since the greenhouse electrical equipment mainly includes lighting equipment, wet curtain water pump motors for temperature, room temperature and humidity adjustment, fan motors and sunshade net motors, all of which are AC loads, so all greenhouse electrical equipment is connected to the output terminal of the inverter. Moreover, the average power of all electrical equipment in the greenhouse is about 2kW, and the load is relatively low, so it is very suitable to use wind-solar hybrid power generation. The system also includes sensing devices connected to the PLC controller, including illuminance sensors and wind speed sensors, and the collected light and wind speed parameters are sent to the PLC controller through the analog input module.

The specific system wiring diagram of the present invention is shown in FIG. 3 . This system uses Siemens S7-200 series PLC, and the I/O allocation table is shown in the following table:

I/O allocation table

input device address output device address Wet curtain water pump motor button SB1 IO.0 Photovoltaic power generation KA1 Q0.0 Fan button SB2 IO.1 Wind power generation KA2 Q0.1 Shade net motor button SB3 IO.2 Battery KA3 Q0.2 Lighting device button SB4 IO.3 Wet curtain water pump motor KA4 Q0.3 Shade net opening limit SQ1 10.4 Fan KA5 Q0.4 Shade net closing limit SQ2 10.5 Shade net motor KA6 Q0.5 light sensor AIW0 Lighting equipment KA7 Q0.6 wind speed sensor AIW2 Overcharge warning light HL1 Q0.7 Over-discharge warning light HL2 Q1.0 Fault indicator HL3 Q1.1

The wiring diagram of the PLC control circuit corresponding to the I/O distribution table is shown in Figure 3.

In order to monitor the power generation system in real time and realize intelligent control, you can also choose to set up a host computer connected to the PLC controller. The host computer is equipped with force control configuration software, which can read and write the PLC controller. Obtain the power consumption of the electrical equipment in the greenhouse, and control the power generation of wind turbines, photovoltaic power generation components, and batteries according to the power consumption. The configuration software can reflect the situation of the power generation system on the monitor of the upper computer in real time, so that the monitor can easily know the status of the system. For large-scale greenhouse power generation application scenarios with a large number of greenhouses, the implementation plan with host computer and power control configuration software is more suitable.

The design of the control system needs to consider the following issues: in sunny and windy conditions, combined photovoltaic and wind power generation; in sunny and windless conditions, photovoltaic power generation; in cloudy and rainy days with wind, wind power generation; When there is no wind, the battery is used for power supply; when the power of the battery reaches the upper limit, the charging circuit of the battery is cut off and an overcharge alarm is issued; when the power of the battery is close to the lower limit, the discharge circuit of the battery is cut off and an overdischarge alarm is issued. Based on the above considerations, a control flow is designed as shown in Figure 3. The control method of this wind-solar hybrid power generation system includes the following steps:

(1) First determine whether there is any electricity demand for electrical equipment. If so, the system judges the weather conditions at the time based on the illuminance sensor and the wind speed sensor, and prioritizes the light conditions. Use photovoltaic power generation when the light conditions are met, and the sunshine conditions do not meet the electricity requirements. Use wind power when needed.

(2) On the basis of step (1), determine whether the power generation meets the power consumption. If so, directly choose to use photovoltaic modules or wind turbines to supply power to the equipment; or use both to provide power. If it is not satisfied, the wind, light and storage battery will be used to supply power to the equipment.

(3) On the basis of step (1), if the wind speed is very small and there is no sunshine on that day, then judge whether the battery power is sufficient for power consumption. If so, the battery will supply power; dynamo.

(4) If there is no electrical equipment in the greenhouse, the system chooses whether to use wind and solar power to charge the battery according to the power of the battery, so as to ensure that the alarm in step (3) does not appear as much as possible.

The comprehensive debugging results of PLC and power control software show that: photovoltaic power generation and wind power generation can be automatically switched on or off according to the system's power demand or the state of the battery; The problem of release; the equipment can guarantee its power supply during operation, and achieve self-sufficiency, without the need for additional power supply from the grid. During the trial process of the system, the stability of the present invention has reached the stability requirement of the traditional power supply mode.

Claims (6)

1. A wind-solar hybrid power generation system for greenhouses, characterized in that: the system includes PLC controllers, power generation equipment, accumulators, sensing equipment and greenhouse electrical equipment connected to the PLC controllers respectively; the power generation equipment includes wind power generators The wind power controller and the photovoltaic controller control the output respectively; the power generation equipment and the storage battery are connected in parallel, and the power supply for the greenhouse electric equipment is supplied through the inverter; the sensing equipment includes an illumination sensor and a wind speed sensor; The electrical equipment for the greenhouse includes lighting equipment, wet curtain water pump motors, fans and sunshade net motors. 2. The wind-solar hybrid power generation system for greenhouses according to claim 1, characterized in that: the system also includes a host computer configured with configuration software, the host computer is connected to the PLC controller, and the PLC can be read and written through the configuration software controller. 3. The wind-solar hybrid power generation system for greenhouses according to claim 1, wherein the illuminance sensor and the wind speed sensor are connected to the PLC controller through an analog input module. 4. The wind-solar hybrid power generation system for greenhouses according to claim 1, characterized in that: the wet curtain water pump motor is connected with a water pump for spraying water to increase the humidity in the greenhouse. 5. The wind-solar hybrid power generation system for greenhouses according to claim 1, characterized in that: the lighting equipment is installed on the roof of the greenhouse, and the sunshade net motor is connected to the sunshade net installed outside the greenhouse roof. 6. A control method for wind-solar hybrid power generation for greenhouses, comprising the following steps: (1) First determine whether there is any electricity demand for electrical equipment. If so, the system judges the weather conditions at the time based on the illuminance sensor and the wind speed sensor, and prioritizes the light conditions. Use photovoltaic power generation when the light conditions are met, and the sunshine conditions do not meet the electricity requirements. use of wind power when needed; (2) On the basis of step (1), judge whether the power generation meets the power consumption. If so, directly choose to use photovoltaic modules or wind turbines to supply power to the equipment; if not, use wind, solar, and storage batteries to power the equipment powered by; (3) On the basis of step (1), if the wind speed is very small and there is no sunshine on that day, it is judged whether the battery power is sufficient for power consumption. If it is satisfied, the battery will supply power; if not, the system will alarm; (4) If there is no electrical equipment in the greenhouse, the system chooses whether to use wind power to charge the battery according to the power of the battery.