Photovoltaic power generation control system and method thereof

Abstract

The application provides a photovoltaic power generation control system and a method thereof, the photovoltaic power generation control system comprising a control module, an environment monitoring module, an operation monitoring module and an electromagnetic interference monitoring module, the control module being in communication connection with the environment monitoring module, the operation monitoring module and the electromagnetic interference monitoring module, the operation monitoring module being arranged at each photovoltaic power generation unit, and the environment monitoring module and the electromagnetic interference monitoring module being evenly arranged at a power generation area.In the application, electromagnetic interference information is detected, and abnormal photovoltaic power generation units and abnormal environment monitoring modules are removed according to the influence of the electromagnetic interference information on sensors, so that the photovoltaic power generation system can avoid making wrong reactions and producing misoperations.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic power generation, in particular to a photovoltaic power generation control system and method thereof. BACKGROUND

[0002] From the world or from China, the conventional energy is very limited. Solar energy is a renewable energy that can be taken and used without limit, which has the advantages of full cleanliness, absolute safety, relative universality, real long service life, maintenance-free, sufficient resources and potential economy, etc. It plays an important role in the long-term energy strategy. The great advantages of solar energy make photovoltaic power generation using solar energy one of the most widely used renewable energy application forms. The output voltage and current of the photovoltaic cell are obviously related to various factors existing in the external environment. The operation data of the environmental factors and the photovoltaic power generation equipment need to be detected, and the control is based on the detection data. However, the photovoltaic power generation system will generate electromagnetic interference during operation, which will affect the operation of the detection equipment, resulting in inaccurate detection data and unable to achieve precise control. SUMMARY

[0003] In order to solve the technical problem that the electromagnetic interference in the prior art leads to inaccurate detection data and unable to achieve precise control, the photovoltaic power generation control system provided by the present application includes a control module, an environment monitoring module, an operation monitoring module and an electromagnetic interference monitoring module, the control module is respectively communicated with the environment monitoring module, the operation monitoring module and the electromagnetic interference monitoring module;

[0004] The operation monitoring module is arranged in each photovoltaic power generation unit, and the environment monitoring module and the electromagnetic interference monitoring module are evenly arranged in the power generation area.

[0005] Preferably, the operation monitoring module includes a voltage sensor, a current sensor and a power sensor, the environment monitoring module includes an illumination intensity sensor, a temperature sensor and a humidity sensor, and the electromagnetic interference monitoring module adopts a wireless radio receiver.

[0006] Based on the above photovoltaic power generation control system, the photovoltaic power generation control method provided by the present application specifically includes the following steps:

[0007] S1, initializing the photovoltaic power generation unit sequence and the environment monitoring module sequence;

[0008] S2, the control module receives the signal of the electromagnetic interference monitoring module, and judges the position of the electromagnetic interference source;

[0009] S3, updating the photovoltaic power generation unit sequence and the environment monitoring module sequence;

[0010] S4, based on the photovoltaic power generation unit sequence and the environmental monitoring module sequence, assigning a corresponding environmental monitoring module to a photovoltaic power generation unit in the photovoltaic power generation unit sequence;

[0011] S5, the control module controls the running state of the photovoltaic power generation unit based on the photovoltaic power generation unit sequence.

[0012] Preferably, in S1, all photovoltaic power generation units are sequentially added to the photovoltaic power generation unit sequence according to the position sequence, and all environmental monitoring modules are sequentially added to the environmental monitoring module sequence according to the position sequence.

[0013] Preferably, in S2, the control module receives a radio signal from the electromagnetic interference monitoring module as a comparison signal, analyzes the frequency spectrum data of the comparison signal through the FPGA chip, compares the frequency spectrum data of the comparison signal with the frequency spectrum data of the reference signal, takes the newly appearing signal as the interference source, and locates the interference source based on the frequency, amplitude and bandwidth of the newly appearing signal.

[0014] Preferably, the reference signal is obtained by detecting the electromagnetic interference monitoring module when all photovoltaic power generation units are not working, and the control module receives the radio signal from the electromagnetic interference monitoring module and stores it as the reference signal.

[0015] Preferably, in S3, the photovoltaic power generation units in the photovoltaic power generation unit sequence that are less than a set threshold from the electromagnetic interference source are marked as abnormal photovoltaic power generation units, the abnormal photovoltaic power generation units in the photovoltaic power generation unit sequence are deleted, the environmental monitoring modules in the environmental monitoring module sequence that are less than a set threshold from the electromagnetic interference source are marked as abnormal environmental monitoring modules, and the abnormal environmental monitoring modules in the environmental monitoring module sequence are deleted.

[0016] Preferably, in S4, each environmental monitoring module is taken as a cluster center, and each photovoltaic power generation unit is assigned to a cluster according to the distance between the photovoltaic power generation unit and the environmental monitoring module, and the corresponding environmental monitoring module of the photovoltaic power generation unit is the environmental monitoring module as the cluster center.

[0017] Preferably, the assignment process of each photovoltaic power generation unit is to calculate the distance between the photovoltaic power generation unit and each environmental monitoring module, determine the minimum value in each distance, if there is only one minimum value, assign the photovoltaic power generation unit to the cluster where the minimum value corresponds to the environmental monitoring module, if there are multiple minimum values, take the cluster where each minimum value corresponds to the environmental monitoring module as a candidate cluster, obtain the number of photovoltaic power generation units in each candidate cluster, and assign the photovoltaic power generation unit to the candidate cluster with the least number of photovoltaic power generation units.

[0018] Preferably, in S5, for each photovoltaic power generation unit in the photovoltaic power generation unit sequence, the maximum power point that can be reached is determined based on the light intensity data, temperature data and humidity data provided by the corresponding environmental monitoring module, the output power of the photovoltaic power generation unit is obtained by running the monitoring module, and maximum power point tracking control is performed.

[0019] Compared with the prior art, the present application has the following beneficial effects:

[0020] The electromagnetic interference information is detected, and abnormal photovoltaic power generation units and abnormal environmental monitoring modules are removed according to the influence of the electromagnetic interference information on the sensor, so as to avoid false reactions of the photovoltaic power generation system and false operations. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the photovoltaic power generation control system of the present application. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be described in detail below in combination with the drawings and specific embodiments.

[0023] The photovoltaic power generation unit is the basic component of the entire photovoltaic power generation system. Each photovoltaic power generation unit includes a panel, an inverter and a controller. Multiple photovoltaic power generation units work cooperatively to participate in power scheduling and management of the entire power generation area.

[0024] As shown in Figure 1 The photovoltaic power generation control system proposed by the present application includes a control module, an environmental monitoring module, a running monitoring module and an electromagnetic interference monitoring module. The control module is communicatively connected with the environmental monitoring module, the running monitoring module and the electromagnetic interference monitoring module. The running monitoring module is arranged at each photovoltaic power generation unit and includes a voltage sensor, a current sensor and a power sensor for detecting the output of the photovoltaic power generation unit. The environmental monitoring module is uniformly arranged in the power generation area and includes a light intensity sensor, a temperature sensor and a humidity sensor. The electromagnetic interference monitoring module is uniformly arranged in the power generation area and uses a radio receiver.

[0025] Based on the photovoltaic power generation control system, the photovoltaic power generation control method specifically includes the following steps:

[0026] S1, initialize the photovoltaic power generation unit sequence and the environmental monitoring module sequence, and sequentially add all photovoltaic power generation units to the photovoltaic power generation unit sequence according to the position order, and sequentially add all environmental monitoring modules to the environmental monitoring module sequence according to the position order.

[0027] S2, the control module receives the signal of the electromagnetic interference monitoring module, judges the position of the electromagnetic interference source. Specifically, the control module receives the radio signal from the electromagnetic interference monitoring module as a comparison signal, analyzes the spectrum data of the comparison signal through the FPGA chip, compares the spectrum data of the comparison signal with the spectrum data of the reference signal, takes the newly appeared signal as the interference source, and locates the interference source based on the frequency, amplitude and bandwidth of the newly appeared signal. The acquisition process of the reference signal is that the electromagnetic interference monitoring module detects when all photovoltaic power generation units are not working, the control module receives the radio signal from the electromagnetic interference monitoring module and stores it as the reference signal.

[0028] S3, update the photovoltaic power generation unit sequence and the environmental monitoring module sequence. Specifically, considering that the distance from the electromagnetic interference source is too close, the data error of the sensor is too large, and it cannot be used for reference, mark the photovoltaic power generation unit in the photovoltaic power generation unit sequence whose distance from the electromagnetic interference source is less than the set threshold as an abnormal photovoltaic power generation unit. Since the voltage, current and power of the abnormal photovoltaic power generation unit cannot be accurately obtained, blind control is easy to cause misoperation, and the abnormal photovoltaic power generation unit is in a state that cannot be controlled, delete the abnormal photovoltaic power generation unit in the photovoltaic power generation unit sequence. Mark the environmental monitoring module in the environmental monitoring module sequence whose distance from the electromagnetic interference source is less than the set threshold as an abnormal environmental monitoring module. Since the control parameter is calculated based on the wrong environmental parameter, the control module will make a wrong reaction. Delete the abnormal environmental monitoring module in the environmental monitoring module sequence.

[0029] S4, based on the photovoltaic power generation unit sequence and the environmental monitoring module sequence, assign the corresponding environmental monitoring module to the photovoltaic power generation unit in the photovoltaic power generation unit sequence. Specifically, take each environmental monitoring module as a clustering center, and assign each photovoltaic power generation unit to each cluster according to the distance between the photovoltaic power generation unit and the environmental monitoring module. The corresponding environmental monitoring module of the photovoltaic power generation unit is the environmental monitoring module as the clustering center. The assignment process of each photovoltaic power generation unit is to calculate the distance between the photovoltaic power generation unit and each environmental monitoring module, determine the minimum value in each distance, if there is only one minimum value, assign the photovoltaic power generation unit to the cluster where the environmental monitoring module corresponding to the minimum value is located, if there are multiple minimum values, take the cluster where the environmental monitoring module corresponding to each minimum value is located as a candidate cluster, get the number of photovoltaic power generation units in each candidate cluster, and assign the photovoltaic power generation unit to the candidate cluster with the least number of photovoltaic power generation units.

[0030] S5, the control module controls the operation state of the photovoltaic power generation unit based on the photovoltaic power generation unit sequence, specifically, for each photovoltaic power generation unit in the photovoltaic power generation unit sequence, based on the light intensity data, temperature data and humidity data provided by the corresponding environment monitoring module, the maximum power point that can be reached is determined, the output power of the photovoltaic power generation unit is obtained through the operation monitoring module, and maximum power point tracking control is performed.

[0031] Steps S1-S5 are periodically performed according to a set time interval (for example, 30 minutes).

[0032] The above only discloses the preferred embodiments of the present application, of course, cannot be limited to the scope of the present application. It should be noted that for those skilled in the art, without departing from the design structure and principles of the present application, equivalent changes made to the present application scheme are considered to be within the scope of the present application.

Claims

1. A photovoltaic power generation control system, characterized in that, The photovoltaic power generation control system includes a control module, an environmental monitoring module, an operation monitoring module, and an electromagnetic interference monitoring module. The control module is communicatively connected to the environmental monitoring module, the operation monitoring module, and the electromagnetic interference monitoring module, respectively. The operation monitoring module is installed in each photovoltaic power generation unit, and the environmental monitoring module and the electromagnetic interference monitoring module are evenly distributed in the power generation area; The location of the electromagnetic interference source is determined based on the data from the electromagnetic interference monitoring module. Abnormal photovoltaic power generation units and abnormal environmental monitoring modules are identified based on the distance between the photovoltaic power generation unit and the environmental monitoring module and the electromagnetic interference source. The abnormal photovoltaic power generation units are deleted from the photovoltaic power generation unit sequence, and the abnormal environmental monitoring modules are deleted from the environmental monitoring module sequence. Based on the updated photovoltaic power generation unit sequence and environmental monitoring module sequence, a clustering algorithm is used to assign corresponding environmental monitoring modules to the photovoltaic power generation units in the photovoltaic power generation unit sequence. The control module controls the operating status of the photovoltaic power generation units based on the photovoltaic power generation unit sequence.

2. The photovoltaic power generation control system according to claim 1, characterized in that, The operation monitoring module includes a voltage sensor, a current sensor, and a power sensor; the environmental monitoring module includes a light intensity sensor, a temperature sensor, and a humidity sensor; and the electromagnetic interference monitoring module uses a radio receiver.

3. A photovoltaic power generation control method, based on the photovoltaic power generation control system of claim 2, characterized in that, The photovoltaic power generation control method specifically includes the following steps: S1. Initialize the photovoltaic power generation unit sequence and the environmental monitoring module sequence; S2. The control module receives the signal from the electromagnetic interference monitoring module and determines the location of the electromagnetic interference source. S3. Update the photovoltaic power generation unit sequence and the environmental monitoring module sequence; S4. Based on the photovoltaic power generation unit sequence and the environmental monitoring module sequence, assign the corresponding environmental monitoring module to the photovoltaic power generation unit in the photovoltaic power generation unit sequence; S5. The control module controls the operating status of the photovoltaic power generation units based on the photovoltaic power generation unit sequence.

4. The photovoltaic power generation control method according to claim 3, characterized in that, In step S1, all photovoltaic power generation units are added to the photovoltaic power generation unit sequence in order of their positions, and all environmental monitoring modules are added to the environmental monitoring module sequence in order of their positions.

5. The photovoltaic power generation control method according to claim 3, characterized in that, In step S2, the control module receives a radio signal from the electromagnetic interference monitoring module as a comparison signal. The FPGA chip analyzes the spectrum data of the comparison signal and compares it with the spectrum data of the reference signal. The newly emerging signal is identified as the interference source, and the interference source is located based on the frequency, amplitude, and bandwidth of the newly emerging signal.

6. The photovoltaic power generation control method according to claim 5, characterized in that, The process of acquiring the reference signal is as follows: when all photovoltaic power generation units are not working, the electromagnetic interference monitoring module performs detection, and the control module receives the radio signal from the electromagnetic interference monitoring module, stores it, and uses it as a reference signal.

7. The photovoltaic power generation control method according to claim 3, characterized in that, In step S3, photovoltaic power generation units in the photovoltaic power generation unit sequence whose distance from the electromagnetic interference source is less than a set threshold are marked as abnormal photovoltaic power generation units, and abnormal photovoltaic power generation units in the photovoltaic power generation unit sequence are deleted. Environmental monitoring modules in the environmental monitoring module sequence whose distance from the electromagnetic interference source is less than a set threshold are marked as abnormal environmental monitoring modules, and abnormal environmental monitoring modules in the environmental monitoring module sequence are deleted.

8. The photovoltaic power generation control method according to claim 3, characterized in that, In step S4, each environmental monitoring module is used as a cluster center. Each photovoltaic power generation unit is assigned to a cluster based on the distance between the photovoltaic power generation unit and the environmental monitoring module. The environmental monitoring module corresponding to the photovoltaic power generation unit is the environmental monitoring module that serves as the cluster center.

9. The photovoltaic power generation control method according to claim 8, characterized in that, The allocation process for each photovoltaic power generation unit involves calculating the distance between the photovoltaic power generation unit and each environmental monitoring module, determining the minimum value among the various distances, and if there is only one minimum value, allocating the photovoltaic power generation unit to the cluster where the environmental monitoring module corresponding to the minimum value is located. If there are multiple minimum values, the clusters where the environmental monitoring modules corresponding to each minimum value are located are taken as candidate clusters, the number of photovoltaic power generation units in each candidate cluster is obtained, and the photovoltaic power generation unit is allocated to the candidate cluster with the fewest photovoltaic power generation units.

10. The photovoltaic power generation control method according to claim 3, characterized in that, In step S5, for each photovoltaic power generation unit in the photovoltaic power generation unit sequence, based on the light intensity data, temperature data, and humidity data provided by its corresponding environmental monitoring module, the maximum power point that can be reached is determined, and the output power of the photovoltaic power generation unit is obtained through the operation monitoring module to perform maximum power point tracking control.

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