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Multi-peak maximum electric power tracking control method based on beta parameter

A power tracking and control method technology, applied in the field of photovoltaic systems, can solve the problems of misjudgment, slow tracking speed, low efficiency, etc., and achieve the effects of high efficiency, fast tracking speed, and high tracking accuracy

Active Publication Date: 2017-07-14
XIAN JIAOTONG LIVERPOOL UNIV
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AI Technical Summary

Problems solved by technology

However, its disadvantages mainly lie in 1) there may be a phenomenon of misjudgment; 2) the tracking speed is slow and the efficiency is low

Method used

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  • Multi-peak maximum electric power tracking control method based on beta parameter
  • Multi-peak maximum electric power tracking control method based on beta parameter
  • Multi-peak maximum electric power tracking control method based on beta parameter

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Embodiment Construction

[0040] When the PV string occurs such as figure 1 The partial occlusion shown can be divided into three cases according to its working status.

[0041] 1. When Module B and Module C stop working due to being short-circuited by the bypass diode, their electrical characteristics are shown as two independent voltage sources Vd, such as image 3 shown. At this time, since the PV string current Istring is mainly provided by Module A, the I-V characteristics of the PV string are mainly dominated by Module A, as shown in Figure 4 shown.

[0042] 2. Similarly, when only Module C stops working due to being short-circuited by the bypass diode, its electrical characteristics also behave as an independent voltage source V d ,Such as Figure 5 shown. At this time, since Module A behaves as a linear voltage source V s , the characteristics of the entire photovoltaic string are mainly dominated by Module B, such as Figure 6 shown.

[0043] 3. Similarly, when all Modules are working...

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Abstract

The invention discloses a multi-peak maximum electric power tracking control method based on the beta parameter. Firstly the equivalent dominant voltage Vdomi of a photovoltaic string is defined, the I-V curve of the whole photovoltaic string is divided into curve portions with peaks, a variable [beta]domi is defined, each portion divided in the above step is further divided, and therefore all peaks including LMPP and GMPP are all in the scope from [beta]max to [beta]min, then a conventional Beta method is employed, intervals divided in the step S3 are tracked, and the GMPP of the whole photovoltaic string is solved. The multi-peak maximum electric power tracking control method based on the beta parameter is high in tracking accuracy, and is simple and clear, and is easy to implement, and the fact that the tracking speed is fast, and the efficiency is high can be ensured at the same time.

Description

technical field [0001] The invention relates to a photovoltaic system, in particular to a multi-peak maximum electric power tracking control method based on β parameters. Background technique [0002] When the PV string is partially shaded, such as figure 1 As shown, multiple local maximum power points (Local Maximum Power Point, LMPP) and a global maximum power point (Global Maximum PowerPoint, GMPP) will appear on the P-V curve, such as figure 2 shown. At this time, traditional MPPT algorithms such as Perturb&Observe (P&O), Incremental Conductance (INC), Beta, etc., may not be able to output at their maximum power, resulting in a drop in power generation efficiency. [0003] In order to solve this problem, many GMPPT algorithms have been proposed. According to its algorithm type, it can be roughly divided into the following three types: [0004] (1) Artificial Intelligence (AI) algorithms, such as Fuzzy Logic Control (FLC), Particle Swarm Optimization (PSO), Simulated...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 李星硕文辉清
Owner XIAN JIAOTONG LIVERPOOL UNIV
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