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Online evaluation method and system for performance ratio weighting of photovoltaic power station

A photovoltaic power station and system performance technology, applied in data processing applications, instruments, calculations, etc., can solve problems such as limitations in the scope of application, difficulty in authenticity of results, and inability to meet effective test and evaluation, so as to increase the scope of application and improve richness sexual effect

Pending Publication Date: 2018-06-12
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are certain limitations in the scope of application of this method. It is suitable for photovoltaic power plants with only one installation inclination angle of photovoltaic modules, but it is not applicable for photovoltaic modules in photovoltaic power plants with multiple inclination angles caused by mountainous terrain and tracking systems.
[0006] At present, there is no unanimously recognized effective test and evaluation method for the performance ratio (PR) of photovoltaic power plant systems. Each test and evaluation method has the following defects more or less: 1. The data accuracy is not high, lacking accuracy, and it is difficult to reflect the results objectively and fairly Authenticity; 2. There are certain limitations in the scope of application, which cannot meet the requirements of effective test and evaluation under various working conditions; 3. Because the models, accuracy and inclination angles of the gas irradiance test devices that come with each photovoltaic power station are not the same , the PR value calculated by using the collected cumulative radiation of each photovoltaic power station is not comparable, and the reference value is not significant

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Embodiment 1

[0035] The invention can realize the continuous long-term high-precision performance ratio PR test and evaluation of the photovoltaic power station, adopt multiple measurement modules to perform sub-regional synchronous measurement and evaluation according to the different installation inclination angles and installation methods of the components, and then perform weighted evaluation to obtain the overall system performance ratio (PR) of the photovoltaic power station. ), to improve the limitations of the traditional performance ratio (PR) measurement and evaluation methods of photovoltaic power plants.

[0036] specific:

[0037] The present invention provides a weighted online evaluation method for the performance ratio of a photovoltaic power plant system, the flow chart of which is as follows figure 2 shown, including the following steps:

[0038] (1) Clarify the type of installation inclination angle of photovoltaic power station system components;

[0039] (2) Divide ...

Embodiment 2

[0053] Based on the same idea, the present invention also provides a photovoltaic power station system performance ratio weighted online evaluation system, its principle diagram is as follows figure 1 As shown, it includes subsystem A, subsystem B, subsystem C and subsystem D of the photovoltaic power station, and evaluation test modules are installed at the corresponding test points of the subsystem A, subsystem B, subsystem C and subsystem D , the evaluation test module is connected to the upper computer control system through a wireless network; the subsystem A, subsystem B, subsystem C and subsystem D are connected to the public power grid through a grid connection point. The evaluation test module measures the irradiance of subsystem A, subsystem B, subsystem C and subsystem D through the radiometer.

[0054] The test and evaluation system adopted by the method of the present invention adopts a modular design concept, integrates high-precision data acquisition sensors and...

Embodiment 3

[0056] The performance ratio (PR) value evaluation of a mountainous photovoltaic power station is carried out. The photovoltaic power station has two module installation methods: one is a fixed installation method, and the other is a tracking installation method. Among them, the fixed installation method has three different installation inclination angles. According to this, the photovoltaic power station is divided into four subsystems (system A, system B, system C, and system D). figure 2 As shown, the specific steps for evaluating the performance ratio (PR) of the power station using the weighted evaluation method are as follows:

[0057] 1) Ensure the normal operation of the photovoltaic power station without power supply during the test;

[0058] 2) Determine the proportion of the capacity of subsystem A, subsystem B, subsystem C and subsystem D to the total station capacity as φ 1 , φ 2 , φ 3 , φ 4 , the upper computer control system sets the data acquisition transm...

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Abstract

The invention relates to an online evaluation method and system for the performance ratio weighting of a photovoltaic power station. An upper computer operating system sends an instruction to carry out synchronous high-accuracy measurement on the GPS (Global Positioning System) timing of each module; each module and the upper computer establish communication through a high-speed wireless transmission device; data is transmitted to an upper computer database in real time; the upper computer analyzes to obtain the PR (Performance Ratio) of each subsystem; and according to the proportion of the practical operation capacity of the component of each subsystem to the practical operation capacity of the photovoltaic module of a whole station during a testing period, weighting calculation is carried out to obtain the PR of the whole system of a photovoltaic power station, the change situation of the PR can be presented on the interface of the upper computer in real time, and the daily PR value, the monthly PR value and the annual PR value of the whole system of each subsystem and the photovoltaic power station can be exported through a statement form. By use of the technical scheme provided by the invention, the applicable range of the evaluation method is enlarged, online testing and evaluation can be carried out for a long time, and the richness, the objectiveness and the reliabilityof the evaluation data can be improved.

Description

technical field [0001] The invention relates to the field of photovoltaic testing, in particular to an on-line evaluation method and system for performance ratio weighting of a photovoltaic power plant system. Background technique [0002] With the rapid development of my country's photovoltaic industry, the power generation performance of photovoltaic power plants has received widespread attention. The system performance ratio (PR) of photovoltaic power plants is an important indicator reflecting the power generation performance of photovoltaic power plants, and has also become an important reference index in the transaction process of photovoltaic power plants. Therefore, its Data reliability is extremely important. [0003] At present, there are two commonly used methods for evaluating the performance ratio (PR) of photovoltaic power plant systems: [0004] The first method is to directly obtain the power generation data of the grid-connected point and the irradiance data...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06393G06Q50/06
Inventor 张双庆李红涛黄晶生刘美茵丁明昌董颖华张晓琳曹磊林小进
Owner CHINA ELECTRIC POWER RES INST