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Method for fuzzy control over MPPT through single-stage photovoltaic Z source inverter

A source inverter and fuzzy control technology, applied in the field of single-stage photovoltaic Z-source inverter fuzzy control MPPT, can solve the problems of large steady-state power fluctuations, low efficiency, long search time, etc., to achieve fast tracking, system Compact structure, realize the effect of normal inverter control

Active Publication Date: 2016-07-06
STATE GRID CORP OF CHINA +4
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Problems solved by technology

[0002] Since changes in the external environment have a greater impact on the distributed photovoltaic power generation system, its output power is directly affected by the current environmental solar radiation and temperature. The maximum power point tracking technology based on intelligent control technology has always been a hot research topic in this field. The traditional disturbance observation Due to the difficulty in choosing a reasonable disturbance step size, the method and the conductance incremental method have the disadvantages of long search time and large fluctuations in steady-state power.
On the other hand, the efficiency of the traditional two-stage photovoltaic power generation system is lower than that of the single-stage Z-source inverter photovoltaic power generation system. Good combination of efficient maximum power point tracking and inverter control

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  • Method for fuzzy control over MPPT through single-stage photovoltaic Z source inverter

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Embodiment Construction

[0016] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0017] Single-stage photovoltaic Z-source inverter fuzzy control maximum power point tracking system, including:

[0018] A photovoltaic voltage sampling module and a photovoltaic current sampling module connected to the solar photovoltaic array, a grid voltage sampling module and a grid current sampling module connected to the three-phase grid;

[0019] Connect to the photovoltaic voltage sampling module, photovoltaic current sampling module and determine the current power P PV A multiplier connected to the power storage of the multiplier, a first subtractor connected to the power storage and calculating the power increment dP, storing the voltage step size V at the previous sampling moment step_last The voltage step size memory, collect the voltage step size memory information to obtain the conductance incremental method voltage change...

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Abstract

The invention discloses a method for fuzzy control over MPPT through a single-stage photovoltaic Z source inverter. Based on a single-stage photovoltaic system of the Z source inverter, the voltage is increased according to the shoot-through time of a Z source network and the inverter, meanwhile, a fuzzy controller with an asymmetric fuzzy membership is adopted for adaptively adjusting the step obtained through a traditional incremental conductance method, and then rapidity and stability of controller tracking are achieved. The system is compact in overall structure and higher in efficiency.

Description

technical field [0001] A control method, especially a fuzzy control MPPT method for a single-stage photovoltaic Z-source inverter. Background technique [0002] Due to the great impact of external environment changes on the distributed photovoltaic power generation system, its output power is directly affected by the current environmental solar radiation and temperature. The maximum power point tracking technology based on intelligent control technology has always been a hot research topic in this field. The traditional disturbance observation The method and the conductance incremental method have the disadvantages of long search time and large steady-state power fluctuations due to the difficulty in choosing a reasonable disturbance step size. On the other hand, the efficiency of the traditional two-stage photovoltaic power generation system is lower than that of the single-stage Z-source inverter photovoltaic power generation system. Efficient maximum power point tracking...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 张经炜王宏华戴锋范立新许焕清王成亮王哲蓓韩伟
Owner STATE GRID CORP OF CHINA
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