CN109149642B - Photovoltaic power generation intelligent inverter control system - Google Patents
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- 238000010248 power generation Methods 0.000 title claims abstract description 133
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- 239000002184 metal Substances 0.000 claims description 21
- 229910052751 metal Inorganic materials 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 15
- 230000032683 aging Effects 0.000 claims description 11
- 238000013021 overheating Methods 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 6
- 238000004458 analytical method Methods 0.000 claims description 3
- 239000011810 insulating material Substances 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 1
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to the field of photovoltaic power generation, in particular to a photovoltaic power generation intelligent inverter control system. The photovoltaic power generation system comprises a photovoltaic power generation part, an inverter part, a photovoltaic controller machine, an accumulator part, an electricity utilization controller, a main control machine, a load and power grid connecting end; each photovoltaic power generation board of the photovoltaic power generation part is provided with a sensor group and a cooling fan; the sensor group comprises a temperature sensor, a current sensor, a voltage sensor and a light intensity sensor; the heat radiation fan is connected with the output end of the photovoltaic power generation board; each photovoltaic power generation panel is connected with an inverter or a storage battery independently, so that independent control over each photovoltaic power generation panel can be realized; each load is independently connected with the inverter, so that independent power supply of the loads can be realized; the photovoltaic power generation panel is provided with a sensor group which can monitor the working state of the photovoltaic power generation panel in real time, so that specific setting is carried out according to the state of the photovoltaic power generation panel.
Description
Technical Field
The invention relates to the field of photovoltaic power generation, in particular to an inverter control system, and particularly relates to an intelligent inverter control system for photovoltaic power generation.
Background
The process of converting dc electric energy into ac electric energy is called inversion, the circuit performing the inversion function is called an inverter circuit, and the apparatus performing the inversion process is called an inverter device or inverter.
With the continuous aggravation of the competition of the photovoltaic inverter industry, the co-purchasing integration and capital operation among large photovoltaic inverter enterprises become more and more frequent, and domestic excellent photovoltaic inverter production enterprises attach more and more importance to the research on the industry market, in particular to the deep research on the trend change of the enterprise development environment and the customer demand.
Application number 201810259429.0 discloses a roof solar power station with a light abandoning control system, which can make full use of the existing roof of a user under the premise of ensuring that a transformer is neither tripped nor burnt, and can be provided with more solar silicon photovoltaic cell panels as much as possible. Although it is possible to implement a controller to control the switches, the control is based only on power control, and the control is too extensive and not fine-tuned for each specific generator board.
Application No. 201810114068.0 discloses a photovoltaic power generation system that can flexibly configure photovoltaic arrays and energy storage devices to cope with electricity consumption peaks and valleys. Although the on state of the photovoltaic device is controlled by using one three-port controller, the photovoltaic device is not specifically set for each photovoltaic power generation panel, and the maximum utilization of photovoltaic energy cannot be realized.
Application number 201810075988.6 discloses a fresh air heat transfer device based on solar photovoltaic power generation semiconductor refrigeration, it utilizes photovoltaic power generation to refrigerate photovoltaic power generation board to improve its conversion efficiency. However, when cooling is not necessary, a large amount of electric energy is wasted if the photovoltaic panel is cooled. Therefore, a photovoltaic inverter control system which is individually controlled for each photovoltaic power generation panel is urgently needed at present.
Disclosure of Invention
In order to solve the above technical problems, a photovoltaic power generation intelligent inverter control system is provided, which includes a photovoltaic power generation portion, an inverter portion, a photovoltaic controller, a storage battery portion, an electricity controller, a main controller, a load and a power grid connection end; the photovoltaic power generation part comprises a plurality of photovoltaic power generation plates which are all connected with the photovoltaic control machine; the input end of the inverter part and the storage battery part are respectively connected with the photovoltaic controller; the output end of the inverter part is connected with an electricity controller, and the electricity controller is connected with the load and the power grid connection end; the photovoltaic control machine, the storage battery part and the electricity control machine are respectively connected with the main control machine; each photovoltaic power generation board of the photovoltaic power generation part is provided with a sensor group and a cooling fan; the sensor group comprises a temperature sensor, a current sensor, a voltage sensor and a light intensity sensor; the heat radiation fan is connected with the output end of the photovoltaic power generation board;
each sensor group collects temperature, light intensity, current and output voltage information of the corresponding photovoltaic power generation panel and transmits the information to the photovoltaic controller; the photovoltaic control machine controls the connection mode of the photovoltaic power generation panel, the inverter part and the storage battery part according to the temperature, light intensity, current and output voltage information of the photovoltaic power generation panel; the photovoltaic control machine controls the switch of the cooling fan corresponding to the photovoltaic power generation panel according to the temperature, light intensity, current and output voltage information of the photovoltaic power generation panel;
and collecting the switching information of the load by using the electric control machine, and controlling the connection mode of the inverter part, the load and the power grid connection end according to the switching information.
The photovoltaic controller is provided with a photovoltaic controller and a plurality of photovoltaic annular three-point switches, and the electricity utilization controller is provided with an electricity utilization controller and a plurality of electricity utilization annular three-point switches; the photovoltaic annular three-point switch and the electric annular three-point switch are the same in structure, an insulating ring is arranged on the outer side of the photovoltaic annular three-point switch, three metal contacts are arranged on the insulating ring, and the three metal contacts are distributed on the arc of the insulating ring at equal intervals; a triangular switch is arranged in the insulating ring and comprises an insulating triangle, one side of the insulating triangle is made of conductive metal, and the other two sides of the insulating triangle are made of insulating materials; the motor is arranged in the center of the insulation triangle and can drive the insulation triangle to rotate; the insulating triangle has three rotational positions, and when the insulating triangle is in one of the three rotational positions, the edge of the insulating triangle made of conductive metal just makes contact with two metal contacts on the insulating ring.
Three metal contacts of the photovoltaic annular three-point switch are respectively connected with a storage battery, an inverter and a photovoltaic power generation board; the photovoltaic controller is connected with a motor of the photovoltaic annular three-point switch, and then the connection state of the photovoltaic annular three-point switch is controlled.
The three metal contacts of the electric annular three-point switch are respectively connected with a storage battery, a power grid and a load; the electric controller is connected with a motor of the electric annular three-point switch, and then the connection state of the electric annular three-point switch is controlled.
The sensor group detects temperature, light intensity, current and voltage information of each photovoltaic power generation panel and generates detection data (T, O, I, U, N), wherein T represents the temperature of the photovoltaic power generation panel, O represents the light intensity received by the photovoltaic power generation panel, I represents the current intensity output by the photovoltaic power generation panel, U represents the output voltage of the photovoltaic power generation panel, and N is the number of the photovoltaic power generation panel; the sensor group collects detection data (T, O, I, U, N) and sends the detection data to a photovoltaic controller in the photovoltaic controller; and the photovoltaic controller sends the detection data (T, O, I, U, N) to the main control computer.
The main control computer calculates the detection data (T, O, I, U, N) to obtain analysis data (T, O, R, N), wherein R = U/I is the internal resistance of the photovoltaic power generation panel; the inside of the main control computer is prestored with control data (T0, O0 and R0), wherein T0 is a temperature threshold, O0 is a light intensity threshold, and R0 is an internal resistance threshold;
when R of the photovoltaic power generation panel is larger than R0 and T is larger than T0, the corresponding photovoltaic power generation panel is in an overheating state; when R of the photovoltaic power generation panel is larger than R0 and T is smaller than T0, the photovoltaic power generation panel is in an aging state; when O is less than O0, the photovoltaic power generation panel is in a non-full power state;
when the photovoltaic power generation panel is in an overheating state, an aging state or a non-full power state, the main control computer sends a command to the photovoltaic controller, and the photovoltaic controller controls the corresponding photovoltaic annular three-point switch to be connected with the photovoltaic power generation panel and the storage battery; when the photovoltaic power generation panel is not in an overheating state, an aging state or a non-full power state, the main control computer sends a command to the photovoltaic controller, and the photovoltaic controller controls the corresponding photovoltaic annular three-point switch to be connected with the photovoltaic power generation panel and the inverter.
The power utilization controller detects a load power on/off request and sends the power on/off request to the main control computer, the main control computer sends a command to the power utilization controller according to the power on/off request of the load, and the power utilization controller controls the power utilization annular three-point switch to switch on the load and the inverter or the power grid and the inverter;
the power utilization controller detects the total power P1 of the load and sends the total power to the main control computer, the main control computer calculates the total power P2 of the photovoltaic power generation panel for switching on the inverter, the total power P2 is multiplied by the efficiency k of the inverter to obtain P3, and if the total power P3 is smaller than P1, the photovoltaic controller is controlled to switch on the storage battery and the inverter through the photovoltaic annular three-point switch corresponding to the power generation panel with the lowest photovoltaic output power.
The priority of the command sent by the main control computer to the photovoltaic controller to switch on the storage battery and the inverter is higher than that of other commands.
The invention has the beneficial effects that: 1) each photovoltaic power generation panel is connected with an inverter or a storage battery independently, so that independent control over each photovoltaic power generation panel can be realized; 2) each load is independently connected with the inverter, so that independent power supply of the loads can be realized; 3) the photovoltaic power generation panel is provided with the sensor group, so that the working state of the photovoltaic power generation panel can be monitored in real time, and specific setting is carried out according to the state of the photovoltaic power generation panel; 4) a novel annular three-point switch is designed, the switch is convenient to control, and the safety factor is high; 5) the state of the photovoltaic power generation panel is divided into a normal state, an overheating state, an aging state and a non-full-power state by combining specific collected data, and the utilization rate of the whole system can be greatly improved by controlling a specific connection mode according to a specific state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosed subject matter, are incorporated in and constitute a part of this specification. The drawings illustrate the implementations of the disclosed subject matter and, together with the detailed description, serve to explain the principles of implementations of the disclosed subject matter. No attempt is made to show structural details of the disclosed subject matter in more detail than is necessary for a fundamental understanding of the disclosed subject matter and various modes of practicing the same.
FIG. 1 is a schematic diagram of the overall structure of the system of the present invention;
FIG. 2 is a schematic diagram of a photovoltaic control machine according to the present invention;
FIG. 3 is a schematic diagram of the electric control machine according to the present invention;
FIG. 4 is a schematic diagram of a photovoltaic annular three-point switch and an electrical annular three-point switch in accordance with the present invention;
fig. 5 is a schematic view of a photovoltaic power generation panel of the present invention.
Detailed Description
The advantages, features and methods of accomplishing the same will become apparent from the drawings and the detailed description that follows.
With reference to fig. 1-5, a photovoltaic power generation intelligent inverter control system includes a photovoltaic power generation portion, an inverter portion, a photovoltaic controller, a storage battery portion, an electricity utilization controller, a main controller, a load and a power grid connection end; the photovoltaic power generation part comprises a plurality of photovoltaic power generation plates which are all connected with the photovoltaic control machine; the input end of the inverter part and the storage battery part are respectively connected with the photovoltaic controller; the output end of the inverter part is connected with an electricity controller, and the electricity controller is connected with the load and the power grid connection end; the photovoltaic control machine, the storage battery part and the electricity control machine are respectively connected with the main control machine; each photovoltaic power generation board of the photovoltaic power generation part is provided with a sensor group and a cooling fan; the sensor group comprises a temperature sensor, a current sensor, a voltage sensor and a light intensity sensor; the heat radiation fan is connected with the output end of the photovoltaic power generation board;
each sensor group collects temperature, light intensity, current and output voltage information of the corresponding photovoltaic power generation panel and transmits the information to the photovoltaic controller; the photovoltaic control machine controls the connection mode of the photovoltaic power generation panel, the inverter part and the storage battery part according to the temperature, light intensity, current and output voltage information of the photovoltaic power generation panel; the photovoltaic control machine controls the switch of the cooling fan corresponding to the photovoltaic power generation panel according to the temperature, light intensity, current and output voltage information of the photovoltaic power generation panel;
and collecting the switching information of the load by using the electric control machine, and controlling the connection mode of the inverter part, the load and the power grid connection end according to the switching information.
The photovoltaic controller is provided with a photovoltaic controller and a plurality of photovoltaic annular three-point switches, and the electricity utilization controller is provided with an electricity utilization controller and a plurality of electricity utilization annular three-point switches; the photovoltaic annular three-point switch and the electric annular three-point switch are the same in structure, an insulating ring is arranged on the outer side of the photovoltaic annular three-point switch, three metal contacts are arranged on the insulating ring, and the three metal contacts are distributed on the arc of the insulating ring at equal intervals; a triangular switch is arranged in the insulating ring and comprises an insulating triangle, one side of the insulating triangle is made of conductive metal, and the other two sides of the insulating triangle are made of insulating materials; the motor is arranged in the center of the insulation triangle and can drive the insulation triangle to rotate; the insulating triangle has three rotational positions, and when the insulating triangle is in one of the three rotational positions, the edge of the insulating triangle made of conductive metal just makes contact with two metal contacts on the insulating ring.
Three metal contacts of the photovoltaic annular three-point switch are respectively connected with a storage battery, an inverter and a photovoltaic power generation board; the photovoltaic controller is connected with a motor of the photovoltaic annular three-point switch, and then the connection state of the photovoltaic annular three-point switch is controlled.
The three metal contacts of the electric annular three-point switch are respectively connected with a storage battery, a power grid and a load; the electric controller is connected with a motor of the electric annular three-point switch, and then the connection state of the electric annular three-point switch is controlled.
The sensor group detects temperature, light intensity, current and voltage information of each photovoltaic power generation panel and generates detection data (T, O, I, U, N), wherein T represents the temperature of the photovoltaic power generation panel, O represents the light intensity received by the photovoltaic power generation panel, I represents the current intensity output by the photovoltaic power generation panel, U represents the output voltage of the photovoltaic power generation panel, and N is the number of the photovoltaic power generation panel; the sensor group collects detection data (T, O, I, U, N) and sends the detection data to a photovoltaic controller in the photovoltaic controller; and the photovoltaic controller sends the detection data (T, O, I, U, N) to the main control computer.
The main control computer calculates the detection data (T, O, I, U, N) to obtain analysis data (T, O, R, N), wherein R = U/I is the internal resistance of the photovoltaic power generation panel; the inside of the main control computer is prestored with control data (T0, O0 and R0), wherein T0 is a temperature threshold, O0 is a light intensity threshold, and R0 is an internal resistance threshold;
when R of the photovoltaic power generation panel is larger than R0 and T is larger than T0, the corresponding photovoltaic power generation panel is in an overheating state; when R of the photovoltaic power generation panel is larger than R0 and T is smaller than T0, the photovoltaic power generation panel is in an aging state; when O is less than O0, the photovoltaic power generation panel is in a non-full power state;
when the photovoltaic power generation panel is in an overheating state, an aging state or a non-full power state, the main control computer sends a command to the photovoltaic controller, and the photovoltaic controller controls the corresponding photovoltaic annular three-point switch to be connected with the photovoltaic power generation panel and the storage battery; when the photovoltaic power generation panel is not in an overheating state, an aging state or a non-full power state, the main control computer sends a command to the photovoltaic controller, and the photovoltaic controller controls the corresponding photovoltaic annular three-point switch to be connected with the photovoltaic power generation panel and the inverter.
The power utilization controller detects a load power on/off request and sends the power on/off request to the main control computer, the main control computer sends a command to the power utilization controller according to the power on/off request of the load, and the power utilization controller controls the power utilization annular three-point switch to switch on the load and the inverter or the power grid and the inverter;
the power utilization controller detects the total power P1 of the load and sends the total power to the main control computer, the main control computer calculates the total power P2 of the photovoltaic power generation panel for switching on the inverter, the total power P2 is multiplied by the efficiency k of the inverter to obtain P3, and if the total power P3 is smaller than P1, the photovoltaic controller is controlled to switch on the storage battery and the inverter through the photovoltaic annular three-point switch corresponding to the power generation panel with the lowest photovoltaic output power.
The priority of the command sent by the main control computer to the photovoltaic controller to switch on the storage battery and the inverter is higher than that of other commands.
When the photovoltaic power generation panel is in an overheated state, the main control computer controls the cooling fan corresponding to the photovoltaic power generation panel to cool the photovoltaic power generation panel.
The main control computer is provided with a screen, and the screen can show the serial number of the photovoltaic power generation panel in an aging state, so that maintenance personnel can overhaul the photovoltaic power generation panel.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A photovoltaic power generation intelligent inverter control system is characterized by comprising a photovoltaic power generation part, an inverter part, a photovoltaic controller, a storage battery part, an electricity controller, a main controller, a load and a power grid connecting end; the photovoltaic power generation part comprises a plurality of photovoltaic power generation plates which are all connected with the photovoltaic control machine; the input end of the inverter part and the storage battery part are respectively connected with the photovoltaic controller; the output end of the inverter part is connected with an electricity controller, and the electricity controller is connected with the load and the power grid connection end; the photovoltaic control machine, the storage battery part and the electricity control machine are respectively connected with the main control machine; each photovoltaic power generation board of the photovoltaic power generation part is provided with a sensor group and a cooling fan; the sensor group comprises a temperature sensor, a current sensor, a voltage sensor and a light intensity sensor; the heat radiation fan is connected with the output end of the photovoltaic power generation board;
each sensor group collects temperature, light intensity, current and output voltage information of the corresponding photovoltaic power generation panel and transmits the information to the photovoltaic controller; the photovoltaic control machine controls the connection mode of the photovoltaic power generation panel, the inverter part and the storage battery part according to the temperature, light intensity, current and output voltage information of the photovoltaic power generation panel; the photovoltaic control machine controls the switch of the cooling fan corresponding to the photovoltaic power generation panel according to the temperature, light intensity, current and output voltage information of the photovoltaic power generation panel;
collecting the switch information of the load by using an electric controller, and controlling the connection mode of the inverter part, the load and the power grid connection end according to the switch information;
the photovoltaic controller is provided with a photovoltaic controller and a plurality of photovoltaic annular three-point switches, and the electricity utilization controller is provided with an electricity utilization controller and a plurality of electricity utilization annular three-point switches; the photovoltaic annular three-point switch and the electric annular three-point switch are the same in structure, an insulating ring is arranged on the outer side of the photovoltaic annular three-point switch, three metal contacts are arranged on the insulating ring, and the three metal contacts are distributed on the arc of the insulating ring at equal intervals; a triangular switch is arranged in the insulating ring and comprises an insulating triangle, one side of the insulating triangle is made of conductive metal, and the other two sides of the insulating triangle are made of insulating materials; the motor is arranged in the center of the insulation triangle and can drive the insulation triangle to rotate; the insulating triangle has three rotational positions, and when the insulating triangle is in one of the three rotational positions, the edge of the insulating triangle made of conductive metal just makes contact with two metal contacts on the insulating ring.
2. The photovoltaic power generation intelligent inverter control system according to claim 1, characterized in that: three metal contacts of the photovoltaic annular three-point switch are respectively connected with a storage battery, an inverter and a photovoltaic power generation board; the photovoltaic controller is connected with a motor of the photovoltaic annular three-point switch, and then the connection state of the photovoltaic annular three-point switch is controlled.
3. The photovoltaic power generation intelligent inverter control system according to claim 2, characterized in that: the three metal contacts of the electric annular three-point switch are respectively connected with a storage battery, a power grid and a load; the electric controller is connected with a motor of the electric annular three-point switch, and then the connection state of the electric annular three-point switch is controlled.
4. The photovoltaic power generation intelligent inverter control system according to claim 3, characterized in that: the sensor group detects temperature, light intensity, current and voltage information of each photovoltaic power generation panel and generates detection data (T, O, I, U, N), wherein T represents the temperature of the photovoltaic power generation panel, O represents the light intensity received by the photovoltaic power generation panel, I represents the current intensity output by the photovoltaic power generation panel, U represents the output voltage of the photovoltaic power generation panel, and N is the number of the photovoltaic power generation panel; the sensor group collects detection data (T, O, I, U, N) and sends the detection data to a photovoltaic controller in the photovoltaic controller; and the photovoltaic controller sends the detection data (T, O, I, U, N) to the main control computer.
5. The photovoltaic power generation intelligent inverter control system according to claim 4, characterized in that: the main control computer calculates the detection data (T, O, I, U, N) to obtain analysis data (T, O, R, N), wherein R = U/I is the internal resistance of the photovoltaic power generation panel; the inside of the main control computer is prestored with control data (T0, O0 and R0), wherein T0 is a temperature threshold, O0 is a light intensity threshold, and R0 is an internal resistance threshold;
when R of the photovoltaic power generation panel is larger than R0 and T is larger than T0, the corresponding photovoltaic power generation panel is in an overheating state; when R of the photovoltaic power generation panel is larger than R0 and T is smaller than T0, the photovoltaic power generation panel is in an aging state; when O is less than O0, the photovoltaic power generation panel is in a non-full power state;
when the photovoltaic power generation panel is in an overheating state, an aging state or a non-full power state, the main control computer sends a command to the photovoltaic controller, and the photovoltaic controller controls the corresponding photovoltaic annular three-point switch to be connected with the photovoltaic power generation panel and the storage battery; when the photovoltaic power generation panel is not in an overheating state, an aging state or a non-full power state, the main control computer sends a command to the photovoltaic controller, and the photovoltaic controller controls the corresponding photovoltaic annular three-point switch to be connected with the photovoltaic power generation panel and the inverter.
6. The photovoltaic power generation intelligent inverter control system according to claim 5, characterized in that: the power utilization controller detects a load power on/off request and sends the power on/off request to the main control computer, the main control computer sends a command to the power utilization controller according to the power on/off request of the load, and the power utilization controller controls the power utilization annular three-point switch to switch on the load and the inverter or the power grid and the inverter;
the power utilization controller detects the total power P1 of the load and sends the total power to the main control computer, the main control computer calculates the total power P2 of the photovoltaic power generation panel for switching on the inverter, the total power P2 is multiplied by the efficiency k of the inverter to obtain P3, and if the total power P3 is smaller than P1, the photovoltaic controller is controlled to switch on the storage battery and the inverter through the photovoltaic annular three-point switch corresponding to the power generation panel with the lowest photovoltaic output power.
7. The photovoltaic power generation intelligent inverter control system of claim 6, characterized in that: the priority of the command sent by the main control computer to the photovoltaic controller to switch on the storage battery and the inverter is higher than that of other commands.
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