CN111999523A - Cloud motion vector measuring device and method - Google Patents
Cloud motion vector measuring device and method Download PDFInfo
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- CN111999523A CN111999523A CN202010829578.3A CN202010829578A CN111999523A CN 111999523 A CN111999523 A CN 111999523A CN 202010829578 A CN202010829578 A CN 202010829578A CN 111999523 A CN111999523 A CN 111999523A
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- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
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Abstract
The invention provides a cloud motion vector measuring device and a method, comprising a central illumination sensor, a plurality of outer illumination sensors and an information processing circuit; the plurality of outer layer illumination sensors and the central illumination sensor are arranged on a horizontal plane under the same illumination condition; the outer layer illumination sensors are uniformly arranged on a semicircular arc; the center of the semicircular arc coincides with the central illumination sensor, the time interval between the irradiance change moment of each outer layer illumination sensor and the irradiance change moment of the central illumination sensor is calculated, and when the time interval between the irradiance change moment of one outer layer illumination sensor and the irradiance change moment of the central illumination sensor is the maximum, the cloud motion direction is along the direction of the connecting line of the outer layer illumination sensor with the maximum time interval and the central illumination sensor, the speed and the direction of a cloud motion vector are judged, and a basis is provided for the output power prediction of a photovoltaic power generation system.
Description
Technical Field
The invention relates to the technical field of meteorological monitoring equipment, in particular to a cloud motion vector measuring device and method.
Background
The output power of the photovoltaic power generation is influenced by the solar radiation period and the random change of various meteorological factors, and the photovoltaic power generation has the characteristics of obvious periodicity, randomness and uncertainty, so that the generated energy is unstable; the proportion of photovoltaic power generation in a power grid is timely controlled and adjusted, so that the main problem that a photovoltaic power station is merged into the existing power grid is solved, and the output power of a photovoltaic power generation system needs to be predicted. The solar ground irradiance is one of main influence factors of the output power of a photovoltaic power station, and the uncertainty of the solar ground irradiance directly causes the randomness and the fluctuation of the output power of photovoltaic power generation. The cloud is used as a main meteorological factor influencing the solar ground irradiance, and the generation, the elimination and the movement change of the cloud are one of the root causes of uncertainty of the ground irradiance, so that the construction of the cloud motion vector measurement system has important significance for photovoltaic power generation power prediction and power grid scheduling. However, the prior art does not have a measurement system capable of accurately measuring the cloud motion vector.
Disclosure of Invention
In order to solve the problems, the invention provides a cloud motion vector measuring device and method, which can measure the speed and the direction of a cloud motion vector and provide a basis for the output power prediction of a photovoltaic power generation system.
The technical scheme is as follows: the invention provides a cloud motion vector measuring device, which comprises a central illumination sensor, a plurality of outer illumination sensors and an information processing circuit, wherein the central illumination sensor is arranged at the top of the central illumination sensor;
the plurality of outer illumination sensors and the central illumination sensor are arranged on a horizontal plane of the same illumination condition; the outer layer illumination sensors are uniformly arranged on a semicircular arc; the center of the semicircular arc is superposed with the central illumination sensor;
the information processing circuit receives irradiance signals of the outer layer illumination sensor and the central illumination sensor;
when the cloud moves, a shadow area formed by the sun shielded by the cloud moves to pass through the central illumination sensor and the outer illumination sensors, so that the irradiance of the central illumination sensor and the outer illumination sensors is changed; the information processing circuit records the irradiance change time of the central light sensor and the irradiance change time of each outer layer light sensor; respectively calculating the time interval of the irradiance change moment of each outer layer illumination sensor and the irradiance change moment of the central illumination sensor;
when the time interval between the irradiance change moment of one outer layer illumination sensor and the irradiance change moment of the central illumination sensor is maximum, if the irradiance change moment of the outer layer illumination sensor with the maximum time interval is earlier than the irradiance change moment of the central illumination sensor, the cloud movement direction is from the outer layer illumination sensor with the maximum time interval to the central illumination sensor; if the irradiance change time of the outer layer illumination sensor with the largest time interval is later than the irradiance change time of the central illumination sensor, the cloud moving direction is from the central illumination sensor to the outer layer illumination sensor with the largest time interval; the cloud movement velocity v is
v＝r/tmax
r is the radius of the semicircular arc, tmaxThe time interval between the irradiance change moment of the outer layer illumination sensor with the largest time interval and the irradiance change moment of the central illumination sensor.
Further, the system also comprises a central information transmission circuit and a plurality of outer information transmission circuits; the central information transmission circuit acquires an irradiance signal of the central illumination sensor and transmits the irradiance signal to the information processing circuit; each outer layer information transmission circuit correspondingly acquires an irradiance signal of one outer layer illumination sensor and transmits the irradiance signal to the information processing circuit.
Furthermore, the central information transmission circuit and the outer information transmission circuits both use a microcontroller CC2530 as a control core; the information processing circuit takes a microcontroller STM32F103ZET6 as a control core.
A cloud motion vector measuring method is provided with a central illumination sensor, a plurality of outer illumination sensors and an information processing circuit;
the plurality of outer illumination sensors and the central illumination sensor are arranged on a horizontal plane of the same illumination condition; the outer layer illumination sensors are uniformly arranged on a semicircular arc; the center of the semicircular arc is superposed with the central illumination sensor;
the information processing circuit receives irradiance signals of the outer layer illumination sensor and the central illumination sensor;
when the cloud moves, a shadow area formed by the sun shielded by the cloud moves to pass through the central illumination sensor and the outer illumination sensors, so that the irradiance of the central illumination sensor and the outer illumination sensors is changed; the information processing circuit records the irradiance change time of the central light sensor and the irradiance change time of each outer layer light sensor; respectively calculating the time interval of the irradiance change moment of each outer layer illumination sensor and the irradiance change moment of the central illumination sensor;
when the time interval between the irradiance change moment of one outer layer illumination sensor and the irradiance change moment of the central illumination sensor is maximum, if the irradiance change moment of the outer layer illumination sensor with the maximum time interval is earlier than the irradiance change moment of the central illumination sensor, the cloud movement direction is from the outer layer illumination sensor with the maximum time interval to the central illumination sensor; if the irradiance change time of the outer layer illumination sensor with the largest time interval is later than the irradiance change time of the central illumination sensor, the cloud moving direction is from the central illumination sensor to the outer layer illumination sensor with the largest time interval; the cloud movement velocity v is
v＝r/tmax
r is the radius of the semicircular arc, tmaxThe time interval between the irradiance change moment of the outer layer illumination sensor with the largest time interval and the irradiance change moment of the central illumination sensor.
Furthermore, a central information transmission circuit and a plurality of outer information transmission circuits are also arranged; the central information transmission circuit acquires an irradiance signal of the central illumination sensor and transmits the irradiance signal to the information processing circuit; each outer layer information transmission circuit correspondingly acquires an irradiance signal of one outer layer illumination sensor and transmits the irradiance signal to the information processing circuit.
Furthermore, the central information transmission circuit and the outer information transmission circuits both use a microcontroller CC2530 as a control core; the information processing circuit takes a microcontroller STM32F103ZET6 as a control core.
Has the advantages that: in the invention, a plurality of outer layer illumination sensors are uniformly arranged on a semicircular arc; the center of the semicircular arc is coincident with the central illumination sensor, the time interval between the irradiance change moment of each outer layer illumination sensor and the irradiance change moment of the central illumination sensor is calculated, the speed and the direction of the cloud motion vector are judged, and a basis is provided for the output power prediction of the photovoltaic power generation system.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a central illumination sensor and a plurality of outer illumination sensors being converted from being in an illuminated area to being in a shaded area;
FIG. 3 is a schematic view of a central illumination sensor and a plurality of outer illumination sensors being converted from being in a shadow area to being in an illumination area;
fig. 4 is a schematic diagram of a relation between a central angle and a cloud motion vector measurement accuracy corresponding to two adjacent outer layer illumination sensors.
Detailed Description
Referring to fig. 1, the present invention provides a cloud motion vector measuring device, which includes a central illumination sensor 1, seven outer illumination sensors 2, and an information processing circuit 3.
The seven outer illumination sensors 2 and the central illumination sensor 1 are arranged on a horizontal plane of the same illumination condition; the outer-layer illumination sensors 2 are uniformly arranged on a semicircular arc; the center of the semi-circular arc coincides with the central illumination sensor 1. The two adjacent outer illumination sensors 2 correspond to a central angle of 30 °.
The invention also comprises a central information transmission circuit 4 and a plurality of outer information transmission circuits 5; the central information transmission circuit 4 acquires an irradiance signal of the central illumination sensor 1 and transmits the irradiance signal to the information processing circuit 3 in a wireless mode; each outer layer information transmission circuit 5 correspondingly acquires an irradiance signal of one outer layer illumination sensor 2 and transmits the irradiance signal to the information processing circuit 3.
The central information transmission circuit 4 and the outer information transmission circuits 5 both use a microcontroller CC2530 as a control core; the information processing circuit 3 takes a microcontroller STM32F103ZET6 as a control core.
When the cloud moves, a shadow area 6 formed by the cloud shading sunlight moves to pass through the central illumination sensor 1 and the outer illumination sensors 2, and when the boundary 601 of the shadow area 6 passes through the central illumination sensor 1 and the outer illumination sensors 2, the irradiance of the central illumination sensor 1 and the outer illumination sensors 2 is changed; including the situation as shown in fig. 2, the central illumination sensor 1 and the plurality of outer layer illumination sensors 2 are located in an illumination area, the shadow area 6 is moved to the central illumination sensor 1 and the plurality of outer layer illumination sensors 2, and the irradiance of the central illumination sensor 1 and the plurality of outer layer illumination sensors 2 is sequentially reduced; as shown in fig. 3, the central illumination sensor 1 and the outer illumination sensors 2 are located under the shadow region 6, the shadow region 6 moves to the outer regions of the central illumination sensor 1 and the outer illumination sensors 2, and the irradiance of the central illumination sensor 1 and the outer illumination sensors 2 increases in sequence.
The information processing circuit 3 records the time of irradiance change of the central light sensor 1 and records the time of irradiance change of each outer layer light sensor 2; and respectively calculating the time interval between the irradiance change moment of each outer-layer illumination sensor 2 and the irradiance change moment of the central illumination sensor 1.
When the time interval between the irradiance change time of one outer layer illumination sensor 2 and the irradiance change time of the central illumination sensor 1 is maximum, if the irradiance change time of the outer layer illumination sensor 2 with the maximum time interval is earlier than the irradiance change time of the central illumination sensor 1, the cloud moving direction is from the outer layer illumination sensor 2 with the maximum time interval to the central illumination sensor 1; if the irradiance change time of the outer layer illumination sensor 2 with the largest time interval is later than that of the central illumination sensor 1, the cloud moving direction is from the central illumination sensor 1 to the outer layer illumination sensor 2 with the largest time interval; the cloud movement velocity v is
v＝r/tmax
r is the radius of the semicircular arc, tmaxOuter layer illumination sensing with maximum time intervalThe time interval between the moment of variation of the irradiance of the fixture 2 and the moment of variation of the irradiance of the central light sensor 1.
As shown in fig. 4, there is a certain relationship between the number of sensors and the measurement accuracy. If the central angle corresponding to two adjacent outer layer illumination sensors 2 is alpha, the error value theta between the cloud motion vector measurement direction D1 and the actual direction D2 is 0 to alpha/2, and the speed error ratio e is 0 to 1-cos theta;
in the present embodiment, seven outer-layer illumination sensors 2 are used, the cloud motion vector direction error value is 0 to 30 °/2 equal to 15 °, and the cloud motion vector speed error ratio is 1-cos15 ° -3.4%.
The greater the number of outer illumination sensors 2, the more accurate the direction and speed measurement of the cloud motion vector.
Claims (6)
1. A cloud motion vector measurement device, characterized in that: comprises a central illumination sensor, a plurality of outer illumination sensors and an information processing circuit;
the plurality of outer illumination sensors and the central illumination sensor are arranged on a horizontal plane of the same illumination condition; the outer layer illumination sensors are uniformly arranged on a semicircular arc; the center of the semicircular arc is superposed with the central illumination sensor;
the information processing circuit receives irradiance signals of the outer layer illumination sensor and the central illumination sensor;
when the cloud moves, a shadow area formed by the sun shielded by the cloud moves to pass through the central illumination sensor and the outer illumination sensors, so that the irradiance of the central illumination sensor and the outer illumination sensors is changed; the information processing circuit records the irradiance change time of the central light sensor and the irradiance change time of each outer layer light sensor; respectively calculating the time interval of the irradiance change moment of each outer layer illumination sensor and the irradiance change moment of the central illumination sensor;
when the time interval between the irradiance change moment of one outer layer illumination sensor and the irradiance change moment of the central illumination sensor is maximum, if the irradiance change moment of the outer layer illumination sensor with the maximum time interval is earlier than the irradiance change moment of the central illumination sensor, the cloud movement direction is from the outer layer illumination sensor with the maximum time interval to the central illumination sensor; if the irradiance change time of the outer layer illumination sensor with the largest time interval is later than the irradiance change time of the central illumination sensor, the cloud moving direction is from the central illumination sensor to the outer layer illumination sensor with the largest time interval; the cloud movement velocity v is
v＝r/tmax
r is the radius of the semicircular arc, tmaxThe time interval between the irradiance change moment of the outer layer illumination sensor with the largest time interval and the irradiance change moment of the central illumination sensor.
2. The cloud motion vector measurement device according to claim 1, wherein: the system also comprises a central information transmission circuit and a plurality of outer information transmission circuits; the central information transmission circuit acquires an irradiance signal of the central illumination sensor and transmits the irradiance signal to the information processing circuit; each outer layer information transmission circuit correspondingly acquires an irradiance signal of one outer layer illumination sensor and transmits the irradiance signal to the information processing circuit.
3. The cloud motion vector measurement device according to claim 2, wherein: the central information transmission circuit and the outer information transmission circuits both use a microcontroller CC2530 as a control core; the information processing circuit takes a microcontroller STM32F103ZET6 as a control core.
4. A cloud motion vector measurement method is characterized in that: arranging a central illumination sensor, a plurality of outer illumination sensors and an information processing circuit;
the plurality of outer illumination sensors and the central illumination sensor are arranged on a horizontal plane of the same illumination condition; the outer layer illumination sensors are uniformly arranged on a semicircular arc; the center of the semicircular arc is superposed with the central illumination sensor;
the information processing circuit receives irradiance signals of the outer layer illumination sensor and the central illumination sensor;
when the cloud moves, a shadow area formed by the sun shielded by the cloud moves to pass through the central illumination sensor and the outer illumination sensors, so that the irradiance of the central illumination sensor and the outer illumination sensors is changed; the information processing circuit records the irradiance change time of the central light sensor and the irradiance change time of each outer layer light sensor; respectively calculating the time interval of the irradiance change moment of each outer layer illumination sensor and the irradiance change moment of the central illumination sensor;
when the time interval between the irradiance change moment of one outer layer illumination sensor and the irradiance change moment of the central illumination sensor is maximum, if the irradiance change moment of the outer layer illumination sensor with the maximum time interval is earlier than the irradiance change moment of the central illumination sensor, the cloud movement direction is from the outer layer illumination sensor with the maximum time interval to the central illumination sensor; if the irradiance change time of the outer layer illumination sensor with the largest time interval is later than the irradiance change time of the central illumination sensor, the cloud moving direction is from the central illumination sensor to the outer layer illumination sensor with the largest time interval; the cloud movement velocity v is
v＝r/tmax
r is the radius of the semicircular arc, tmaxThe time interval between the irradiance change moment of the outer layer illumination sensor with the largest time interval and the irradiance change moment of the central illumination sensor.
5. The cloud motion vector measurement method according to claim 4, wherein: a central information transmission circuit and a plurality of outer information transmission circuits are also arranged; the central information transmission circuit acquires an irradiance signal of the central illumination sensor and transmits the irradiance signal to the information processing circuit; each outer layer information transmission circuit correspondingly acquires an irradiance signal of one outer layer illumination sensor and transmits the irradiance signal to the information processing circuit.
6. The cloud motion vector measurement method according to claim 5, wherein: the central information transmission circuit and the outer information transmission circuits both use a microcontroller CC2530 as a control core; the information processing circuit takes a microcontroller STM32F103ZET6 as a control core.
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| CN202010829578.3A CN111999523A (en) | 2020-08-18 | 2020-08-18 | Cloud motion vector measuring device and method |
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Citations (4)
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| TW201117512A (en) * | 2009-08-05 | 2011-05-16 | First Solar Inc | Cloud tracking |
| CN109344491A (en) * | 2018-09-27 | 2019-02-15 | 河北工业大学 | A kind of solar irradiance modeling method considering weather state change and cloud cover |
| CN109543721A (en) * | 2018-11-05 | 2019-03-29 | 中国科学院寒区旱区环境与工程研究所 | A kind of solar irradiance ultra-short term forecasting procedure under fine with occasional clouds weather condition |
| JP2019060754A (en) * | 2017-09-27 | 2019-04-18 | 国立研究開発法人情報通信研究機構 | Cloud altitude and wind velocity measurement method using optical image |
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2020
- 2020-08-18 CN CN202010829578.3A patent/CN111999523A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201117512A (en) * | 2009-08-05 | 2011-05-16 | First Solar Inc | Cloud tracking |
| JP2019060754A (en) * | 2017-09-27 | 2019-04-18 | 国立研究開発法人情報通信研究機構 | Cloud altitude and wind velocity measurement method using optical image |
| CN109344491A (en) * | 2018-09-27 | 2019-02-15 | 河北工业大学 | A kind of solar irradiance modeling method considering weather state change and cloud cover |
| CN109543721A (en) * | 2018-11-05 | 2019-03-29 | 中国科学院寒区旱区环境与工程研究所 | A kind of solar irradiance ultra-short term forecasting procedure under fine with occasional clouds weather condition |
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