Distributed photovoltaic power station electric energy quality detection system

Abstract

The utility model relates to the technical field of photovoltaic power station operation and maintenance, and particularly provides a distributed photovoltaic power station electric energy quality detection system, which comprises a data acquisition module, a data transmission module and the like. The data acquisition module is responsible for acquiring power grid electric energy data, the data transmission module transmits the acquired electric energy data to the data processing module, and the data processing module processes the electric energy data, including electric energy quality analysis, graph drawing and the like, and performs classified statistics on different types of electric energy quality according to requirements. The detection system provided by the utility model can track the power quality of a power grid in real time, record the voltage fluctuation, abnormal jump and harmonic content of the power grid in real time, provide professional energy consumption analysis according to the energy consumption condition of a user, and effectively determine the energy consumption of the distributed photovoltaic power station due to the abnormal power quality of the power grid. The method provides an analysis basis for the problems of equipment failure of the photovoltaic system, abnormal tripping of the grid-connected circuit breaker and the like, avoids equipment damage and accident expansion, and practically improves the stability and reliability of the operation of the photovoltaic system.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic power station operation and maintenance, and specifically relates to a distributed photovoltaic power station power quality detection system. Background Art

[0002] In recent years, with the strong support of the state for distributed photovoltaic projects, the capacity of photovoltaic power stations across the country has increased day by day. The power generation of photovoltaic power stations is seriously affected by sunshine, showing large fluctuations, which will have a certain impact on the power quality of the power grid. At the same time, the power load of various industrial enterprises is also dynamically fluctuating, especially when high-power equipment is started, the grid voltage will be pulled down a lot.

[0003] On the other hand, the reliability of power supply of the power grid will also change due to changes in climatic conditions, especially in thunderstorms, when the voltage of the power grid fluctuates greatly, and even drops instantly, affecting the normal operation of electrical equipment. This patent can be used to study the impact of power quality of the power grid on the operation of photovoltaic equipment, find out the cause of abnormal tripping of grid-connected circuit breakers, and play a guiding role in the operation and maintenance management of photovoltaic power stations. Utility Model Content

[0004] The utility model provides a distributed photovoltaic power station power quality detection system for tracking the power quality of the power grid, real-time recording of grid voltage fluctuations, abnormal jumps, and harmonic content, and can provide professional energy consumption analysis based on user energy consumption, effectively improving the stability and reliability of photovoltaic system operation.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme.

[0006] The utility model provides a distributed photovoltaic power station power quality detection system, which is used to detect the power quality of the distributed photovoltaic power station power grid. The detection system includes a data acquisition module, a data transmission module, a data processing module, and an image display module; the data acquisition module is responsible for collecting power grid power data, the data transmission module transmits the collected power data to the data processing module via the data transmission module, the data processing module processes the power data, and the data processing module includes an algorithm processing circuit module, a power quality analysis circuit module, and a graphics drawing circuit module, so as to realize classification and statistics of different types of power quality as required, and finally accurately display the data via the image display module.

[0007] Preferably, the data acquisition module includes a voltage transmitter, a current transmitter, and a collector.

[0008] In any of the above technical solutions, it is preferred that the voltage transmitter is connected to a collector, which is used to collect the grid voltage and convert the voltage into a 0-5V voltage signal and output it to the collector.

[0009] In any of the above technical solutions, it is preferred that the current transmitter is connected to a collector, which is used to collect grid current and convert the current into a 4-20mA current signal and output it to the collector.

[0010] In any of the above technical solutions, it is preferred that the collector includes a standing industrial communication gateway based on RISC architecture, which is compatible with multiple industrial standard communication protocols Modbus and IEC-60870, and is used to receive secondary signals from voltage transmitters and current transmitters, and forward the signals to the data processing module through the data transmission module.

[0011] In any of the above technical solutions, it is preferred that the data transmission module is embedded in the collector, which supports Ethernet wired communication and WIFI / 3G / GPRS / 4G wireless communication, and is used to realize communication between the collector and the data processing module.

[0012] In any of the above technical solutions, it is preferred that the data processing module is connected to the collector of the data acquisition module, which receives the secondary signals of the grid voltage and current uploaded by the collector, analyzes the signals, restores them to actual values, completes data processing as required, and then outputs them to the image display module in the form of waveforms and numerical values.

[0013] In any of the above technical solutions, it is preferred that the image display module uses a 2K 144Hz high-refresh display to receive the output content of the data processing module and achieve accurate display.

[0014] Compared with the prior art, the above technical solution of the utility model has the following beneficial effects:

[0015] The distributed photovoltaic power station power quality detection system of the utility model is mainly composed of a data acquisition module, a data transmission module, a data processing module, and an image display module; the data acquisition module is responsible for collecting power data of the power grid, the data transmission module transmits the collected power data to the data processing module, and the data processing module processes the power data, including an algorithm processing circuit, a power quality analysis circuit, a graphics drawing circuit, etc., to achieve classification and statistics of different types of power quality as required. The distributed photovoltaic power station power quality detection system of the utility model can track the power quality of the power grid in real time, record the voltage fluctuation, abnormal jump, and harmonic content of the power grid in real time, and provide professional energy consumption analysis according to the energy consumption of users, which can effectively provide analysis basis for photovoltaic system equipment failures and abnormal tripping of grid-connected circuit breakers caused by abnormal power quality of the power grid in distributed photovoltaic power stations, avoid equipment damage and accident expansion, and effectively improve the stability and reliability of photovoltaic system operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0017] Figure 1 A schematic diagram of the system principle of a preferred embodiment of a distributed photovoltaic power station power quality detection system according to the utility model;

[0018] Figure 2 The present invention is a schematic diagram of the structure of a data acquisition and transmission system according to a preferred embodiment of a distributed photovoltaic power station power quality detection system of the present invention.

[0019] Figure 3 The figure is a schematic diagram of a voltage waveform output by a data analysis system according to a preferred embodiment of a distributed photovoltaic power station power quality detection system of the utility model. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The protection scope of the utility model is not limited by the specific implementation methods. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0021] In order to solve the problems of photovoltaic system equipment failure and abnormal tripping of grid-connected circuit breakers caused by abnormal power quality of the power grid during on-site inspection of distributed photovoltaic power stations, avoid equipment damage and the expansion of accidents, and effectively improve the stability and reliability of photovoltaic system operation.

[0022] The following combination Figures 1 to 3 The structure, technical features and application forms of the distributed photovoltaic power station power quality detection system of this embodiment are described.

[0023] The distributed photovoltaic power station power quality detection system provided in this embodiment is used to detect the power quality of the distributed photovoltaic power station grid, such as Figure 1As shown, the detection system includes a data acquisition module, a data transmission module, a data processing module, and an image display module; the data acquisition module is responsible for collecting power data of the power grid, the data transmission module transmits the collected power data to the data processing module via the data transmission module, the data processing module performs algorithm processing on the power data, the data processing module includes an algorithm processing circuit module, a power quality analysis circuit module, and a graphics drawing circuit module, so as to realize classification and statistics of different types of power quality as required, and finally accurately display the data through the image display module.

[0024] In this embodiment, the data acquisition module includes a voltage transmitter, a current transmitter, and a collector.

[0025] In this embodiment, the voltage transmitter is connected to the collector, which is used to collect the grid voltage and convert the voltage into a 0-5V voltage signal and output it to the collector.

[0026] In this embodiment, the current transmitter is connected to the collector, which is used to collect the grid current and convert the current into a 4-20mA current signal and output it to the collector.

[0027] In this embodiment, the collector includes a standing industrial communication gateway based on RISC architecture, which is compatible with multiple industrial standard communication protocols Modbus and IEC-60870, and is used to receive secondary signals from voltage transmitters and current transmitters, and forward the signals to the data processing module through the data transmission module.

[0028] In this embodiment, the data transmission module is embedded in the collector, which supports Ethernet wired communication and WIFI / 3G / GPRS / 4G wireless communication, and is used to realize communication between the collector and the data processing module.

[0029] In this embodiment, the data processing module is connected to the collector of the data acquisition module, which receives the secondary signals of the grid voltage and current uploaded by the collector, analyzes the signals, restores them to actual values, completes data processing as required, and then outputs them to the image display module in the form of waveforms and numerical values.

[0030] In this embodiment, the image display module uses a 2K 144Hz high refresh display to receive the output content of the data processing module and achieve accurate display.

[0031] The distributed photovoltaic power station power quality detection system with the above structure can be used to detect and analyze the power quality of the distributed photovoltaic power station power grid. The data acquisition module is responsible for collecting power grid power data, and the data transmission module transmits the collected power data to the data processing module. The data processing module processes the power data. The data processing module may include an algorithm processing circuit module, a power quality analysis circuit module, and a graphics drawing circuit module to realize the classification and statistics of different types of power quality as required.

[0032] The distributed photovoltaic power station power quality detection system of the utility model can track the power quality of the power grid in real time, record the voltage fluctuation, abnormal jump and harmonic content of the power grid in real time, and provide professional energy consumption analysis according to the energy consumption of the user. It can effectively provide an analysis basis for the problems such as photovoltaic system equipment failure and abnormal tripping of grid-connected circuit breakers caused by abnormal power quality of the power grid in the distributed photovoltaic power station, avoid equipment damage and the expansion of accidents, and effectively improve the stability and reliability of the operation of the photovoltaic system.

[0033] In the specific implementation, Figures 1 to 3 As shown, the voltage transmitter collects the grid voltage and converts the voltage into a 0-5V voltage signal and outputs it to the collector; the current transmitter collects the grid current and converts the current into a 4-20mA current signal and outputs it to the collector; the collector receives the secondary signals of the voltage transmitter and the current transmitter, and forwards the signals to the data processing module through the data transmission module; the data processing module receives the grid voltage and current secondary signals uploaded by the collector, analyzes the signals, restores them to actual values, completes data processing as required, and then outputs them to the image display module in the form of waveforms and values; the image display module uses a 2K 144Hz high-refresh display to receive the output content of the data processing module and realize accurate display ( Figure 3 ).

[0034] In a specific implementation, the algorithm processing circuit module in the data processing module can use a commercially available processor with an FPGA SOC chip or an ADC chip, and programmable interconnection can be used to implement data algorithm processing. The power quality analysis circuit module can be composed of a sampling circuit, an analog-to-digital signal conversion circuit, a controller, a signal conditioning unit, a filtering circuit, etc. The graphics drawing circuit module can be composed of a data analysis circuit, a data model building circuit, a data generation circuit, etc.

[0035] The above description is only a description of the preferred implementation mode of the utility model, and is not intended to limit the scope of the utility model; the above description is only a specific implementation mode of the utility model, and is not intended to limit the protection scope of the utility model; without departing from the design spirit of the utility model, any modification, equivalent substitution, improvement, etc. made to the technical solution of the utility model by ordinary engineering and technical personnel in this field shall fall within the protection scope determined by the claims of the utility model.

Claims

1. A distributed photovoltaic power station power quality detection system, used to detect the power quality of the distributed photovoltaic power station grid, characterized by: The detection system includes a data acquisition module, a data transmission module, a data processing module, and an image display module; the data acquisition module is responsible for collecting power data of the power grid, the data transmission module transmits the collected power data to the data processing module via the data transmission module, the data processing module processes the power data, and the data processing module includes an algorithm processing circuit module, a power quality analysis circuit module, and a graphics drawing circuit module, so as to realize classification and statistics of different types of power quality as required, and finally accurately display the data through the image display module.

2. The distributed photovoltaic power station power quality detection system according to claim 1, characterized in that: The data acquisition module includes a voltage transmitter, a current transmitter and a collector.

3. The distributed photovoltaic power station power quality detection system according to claim 2, characterized in that: The voltage transmitter is connected to the collector, and is used to collect the grid voltage and convert the voltage into a 0-5V voltage signal and output it to the collector.

4. The distributed photovoltaic power station power quality detection system according to claim 2, characterized in that: The current transmitter is connected to the collector, and is used to collect the grid current and convert the current into a 4-20mA current signal and output it to the collector.

5. The distributed photovoltaic power station power quality detection system according to claim 2, characterized in that: The collector includes a standing industrial communication gateway based on RISC architecture, which is compatible with multiple industrial standard communication protocols Modbus and IEC-60870, and is used to receive secondary signals from voltage transmitters and current transmitters, and forward the signals to the data processing module through the data transmission module.

6. The distributed photovoltaic power station power quality detection system according to claim 2, characterized in that: The data transmission module is embedded in the collector, and supports Ethernet wired communication and WIFI / 3G / GPRS / 4G wireless communication, and is used to realize communication between the collector and the data processing module.

7. The distributed photovoltaic power station power quality detection system according to claim 1, characterized in that: The data processing module is connected to the collector of the data acquisition module, receives the secondary signals of the grid voltage and current uploaded by the collector, analyzes the signals, restores them to actual values, completes data processing as required, and then outputs them to the image display module in the form of waveforms and numerical values.

8. The distributed photovoltaic power station power quality detection system according to claim 1, characterized in that: The image display module uses a 2K 144Hz high-refresh display to receive the output content of the data processing module and achieve accurate display.

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