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Photovoltaic inverter MPPT control method based on three-point comparison method

A photovoltaic inverter and maximum power point technology, applied in photovoltaic power generation, control/regulation systems, instruments, etc., can solve problems such as false disturbance, complex structure, cumbersome steps, etc., and achieve the goal of improving output efficiency and reducing disturbance amplitude Effect

Inactive Publication Date: 2014-10-22
安徽金峰新能源股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing two-point comparison method to determine the direction of voltage disturbance is prone to false disturbances and local maximum power points, and the improved "mountain climbing method" has complex structure, cumbersome steps, and is not conducive to maintenance. This provides a control method for maximum power point tracking of photovoltaic inverters based on the three-point comparison method that avoids the defects of the two-point comparison method and has simple steps.

Method used

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Embodiment Construction

[0014] by figure 1 The three points A, B and C are taken as examples, and the specific implementation process of the present invention is introduced in detail.

[0015] Let the voltage at A be U 0 , the current is I, and the power Pa at point A is calculated, and the upper and lower sides of point A are sampled with the same step size △U, the sampling points are B and C, and the voltage at point B is U 0 +△U, the power is Pb, the voltage at point C is U 0 -△U, the power is Pc, such as figure 2 As shown, compare Pa and Pb, if PaPb, then subtract 1 from the counter num, continue to compare Pa and Pc, if Pa>Pc, add 1 to the counter num, if Pa

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Abstract

The invention discloses a photovoltaic inverter MPPT control method based on a three-point comparison method. The method comprises the steps that (1) three-point continuous sampling is performed, wherein a point A, a point B and a point C on a solar cell P-V characteristic curve are selected at will for sampling, the three points are close, the voltage of the point A is U0, the power of the point A is Pa, the voltage of the point B is U0+delta U, the power of the point B is Pb, the voltage of the point C is U0-delta U, and the power of the point C is Pc; (2) the direction of voltage disturbance is judged, if Pa is smaller than Pb, a counter num plus one, or else, the counter num minus one, if Pa is greater than Pc, the counter num plus one, and or else, the counter num minus one; (3) with time T being a period, the magnitude of delta U is changed, and disturbance voltage is changed to the peak value delta Umax. By the adoption of the three-point comparison method, no judgment caused by the change of the external environment can be effectively avoided, and therefore an invertor control system can track the MPP accurately and effectively.

Description

technical field [0001] The invention relates to the field of photovoltaic inverters, in particular to a control method for maximum power point tracking of photovoltaic inverters based on a three-point comparison method. Background technique [0002] Photovoltaic inverter is the key equipment of solar photovoltaic power generation system. It converts the direct current generated by the solar photovoltaic cell array into alternating current that meets the quality requirements of the power grid and provides it to local users and the power grid. With the explosive growth of photovoltaic power plants, photovoltaic power generation efficiency is an important indicator and directly produces economic benefits. [0003] The main factors affecting the efficiency of photovoltaic inverters are: firstly, the power semiconductors are continuously chopping in the circuit to convert direct current into alternating current, and the power semiconductors generate heat loss; secondly, the react...

Claims

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 徐遥程刚査宏胜聂群
Owner 安徽金峰新能源股份有限公司
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