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A fault modeling and simulation method for photovoltaic systems

A photovoltaic system and simulation method technology, applied in the field of photovoltaic systems, can solve the problems of inconvenient development of online fault diagnosis methods, limited fault types, and large amount of calculation, so as to achieve convenient and fast fault analysis and research, reduce the number of calculation iterations, and improve power generation efficiency effect

Active Publication Date: 2022-08-09
HOHAI UNIV CHANGZHOU
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  • Claims
  • Application Information

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Problems solved by technology

However, this simulation model has the following three disadvantages: (1) poor shifting ability; (2) since most circuit-based simulation software is commercial, the investment cost is high; (3) the calculation efficiency is poor, and the circuit structure The more complex, the greater the amount of calculation
Due to the above reasons, it is not easy to develop photovoltaic system research and online fault diagnosis methods. At present, some scholars have proposed a code-based fast fault simulation modeling method, but the types of faults simulated are limited, and it is not possible to simulate various concurrent faults such as bypass diode open circuit. fault simulation

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  • A fault modeling and simulation method for photovoltaic systems
  • A fault modeling and simulation method for photovoltaic systems
  • A fault modeling and simulation method for photovoltaic systems

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Embodiment

[0151] Modeling of monolithic components (N sd =3, N cell =20), the component model is TMS-240, and the component nameplate parameter is the short-circuit point current I under STC sc_stc =8.62A, open-circuit point voltage V oc_stc =37.3V, maximum power point current I mpp_stc =8.1A, the maximum power point voltage V mpp_stc = 29.7V and the maximum power point P mpp_stc =240W, short-circuit current temperature coefficient α=0.047% / ℃, open-circuit voltage temperature coefficient β=-0.32% / ℃, in Matlab of computer (processor: Intel(R) Core(TM) i7-9750H CPU@2.60GHZ) Simulation in the build environment. Figure 4 It is the simulation of the IV characteristic curve of the photovoltaic module under the fault-free state obtained by the simulation method of the present invention; for the input of the model parameters without fault, G:,:=594 represents the irradiance of all sub-string cells in the string irradiance matrix G. The illuminance is 594W / m2, T:=48.14 means that the temp...

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Abstract

The invention discloses a photovoltaic system fault modeling and simulation method. By simulating the scanning principle of a photovoltaic inverter with an IV characteristic curve scanning function, and by simulating the current scanning principle, the current step size is increased with a certain adaptive step size, and the calculation Corresponding to the output voltage of each cell under the current, the IV characteristic curve of the entire string is obtained by superimposing the voltage of each cell, and the avalanche breakdown is considered according to the reverse characteristics of the bypass diode open fault of the photovoltaic module. The single-diode model can not only accurately reflect the forward characteristics of the IV characteristic curve of photovoltaic modules, but also accurately express the S-type trend of the reverse characteristics, and can model the open-circuit fault of the bypass diode of photovoltaic modules more accurately.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic systems, and in particular relates to a fault modeling and simulation method for photovoltaic systems. Background technique [0002] In photovoltaic systems, photovoltaic modules and arrays are the core components of the entire power generation system. Modeling and simulating them to study the output characteristics of photovoltaic systems under different operating conditions and fault conditions is an important basis for the research and design of photovoltaic power generation systems. Research on maximum power point tracking algorithms, the preferred approach for PV system fault detection and diagnosis, and performance evaluation. At present, most modeling and simulation of photovoltaic modules and arrays are established in circuit-based simulation software, such as MTALAB-Simulink, PSIM, SPS, etc. However, this simulation model has the following three disadvantages: (1) poor shifting abil...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q50/06
CPCG06Q50/06Y02E10/50
Inventor 丁坤刘永杰张经炜李元良
Owner HOHAI UNIV CHANGZHOU