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High-efficiency mppt control strategy applicable to photovoltaic system

A photovoltaic system and control strategy technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve the problems of slow tracking speed, low accuracy, and high accuracy, improve accuracy, ensure tracking speed, and reduce the probability of misjudgment Effect

Inactive Publication Date: 2012-11-07
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology

[0004] The disturbance observation method is divided into the fixed step size disturbance observation method and the variable step size disturbance observation method. In the fixed step size disturbance observation method, the step size selection is small, the accuracy is high but the tracking speed is slow, and the step size selection is large, the speed is fast but the tracking speed is slow. Low precision, tracking speed and tracking accuracy are an irreconcilable contradiction

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  • High-efficiency mppt control strategy applicable to photovoltaic system
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  • High-efficiency mppt control strategy applicable to photovoltaic system

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Embodiment Construction

[0020] figure 1 The given photovoltaic cell array I-V&P-V characteristic curve is one of the most important technical data for system analysis, and the diagram shows that it has strong nonlinear characteristics.

[0021] Under a given sunshine condition, the photovoltaic cell array is short-circuited ( = 0), the current is short-circuit current at this time ; Photovoltaic cell array open circuit ( = 0), the voltage at this time is the open circuit voltage . When the voltage of the photovoltaic array rises, the output power increases from zero. When the voltage reaches a certain value, the power can reach the maximum. When the output voltage continues to increase, the power begins to decrease and finally decreases to zero. The point at which the output power of the photovoltaic cell array is the largest is called the maximum power point, and the voltage corresponding to this point is called the maximum power point voltage ; The current corresponding to this point is c...

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Abstract

The invention relates to a high-efficiency mppt control strategy applicable to a photovoltaic system. By the high-efficiency mppt control strategy, the output voltage of a photovoltaic battery can be adjusted dynamically in real time and maximum power output of the photovoltaic system can be realized. The high-efficiency mppt control strategy has the beneficial effects that the requirements of the system on precision and speed are taken into consideration by adopting a variable step size perturbation and observation method control method.

Description

technical field [0001] The invention relates to a control method for maximizing the power generation efficiency of photovoltaic cells, which is applicable to grid-connected power generation occasions of photovoltaic new energy sources of various large, medium and small power levels. Background technique [0002] Photovoltaic power generation, as an important part of clean energy power generation, has shown a vigorous development trend in recent years. Due to the characteristics of the working principle of photovoltaic cells-under the external environment (temperature, sunshine, angle, etc.) of the system, different array output voltages can be To obtain different output powers, in order to output as much electric energy as possible, the photovoltaic system must perform maximum power tracking (MPPT) control on the system. At present, MPPT algorithms mainly include perturbation and observation method and conductance incremental method. [0003] The algorithm of the conductanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCY02E10/58Y02E10/56
Inventor 田新全宋飞王彤周敏陈梅吴福保丁杰吕宏水
Owner STATE GRID ELECTRIC POWER RES INST
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