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Method and system for multi-peak maximum power tracking of photovoltaic system

A maximum power tracking and photovoltaic system technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., it can solve the problems of weak global search ability of MPPT algorithm, and the working point is trapped in local extremum, so as to avoid global optimization ability. Not strong, accurate maximum power point effect

Active Publication Date: 2016-08-17
ZHEJIANG UNIV
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Problems solved by technology

[0008] The purpose of the present invention is to provide a photovoltaic system multi-peak maximum power tracking method and system, the tracking method and system can solve the problem that the traditional MPPT algorithm is not strong in global search ability, and it is easy to make the working point fall into the local extremum. The tracking method of the present invention The method has a stronger global optimization ability and will not miss the global optimum

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  • Method and system for multi-peak maximum power tracking of photovoltaic system
  • Method and system for multi-peak maximum power tracking of photovoltaic system

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Embodiment approach

[0055] As an optional implementation, the next-generation particle voltage:

[0056] V i ( n + 1 ) = p i ± β × | p i - V i ( n ) | × l n ( 1 u ) ,

[0057] Among them, V i (n+1) is the particle voltage at the n+1th iteration, V i (n) is the particle voltage at the nth iteration, u is a random number on (0, 1), a new random number is selected for each calculation, p i is the potential well point of particle i’s current quantum motion in the iteration process, r 1 , r 2 It is a random number on (0, 1), β is the vergence factor,...

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Abstract

The invention discloses a method and system for multi-peak maximum power tracking of a photovoltaic system. In a successive iterative mode, output voltages of a photovoltaic array are updated one by one, output power is obtained, obtained power is compared so as to determine a working voltage corresponding to a particle maximum power point after the iteration of each particle, maximum power point power of all particles in a particle swarm is compared, a population working voltage corresponding to a population maximum power point in the particle swarm is determined, and thus a multi-peak maximum power point under complex conditions is determined. Thus, it can be seen that according to the tracking method, particles are used in a working interval of voltage to perform quantum behavior search, and the problem that a conventional maximum power point tracking (MPPT) algorithm is not high in global optimization capability and easily causes a working point to fall into local extremum is solved. The maximum power point in the photovoltaic system, which is searched by adoption of the method and the system, is more accurate and more practical.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation engineering, in particular to a multi-peak maximum power tracking method and system for a photovoltaic system. Background technique [0002] Due to partial shadow shading, dust accumulation, and differences in output characteristics of photovoltaic cells in photovoltaic arrays, the output characteristic curve of photovoltaic arrays presents multi-peak power characteristics, and its maximum power tracking problem has become an important direction in the field of photovoltaic power generation research. At present, there are mainly three solutions to the multi-peak maximum power tracking problem disclosed in academic papers and invention patents: (a) one is to use the current compensation method to make the output status of each module in the photovoltaic array under partial shadowing the same, and the multi-peak The output characteristic curve becomes a single-peak curve, so th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 李玉玲王一蒙陈予吒
Owner ZHEJIANG UNIV
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