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Fast state tracking variable step size MPPT photovoltaic power generation stability control method

A technology of stability control and photovoltaic power generation. It is applied in photovoltaic power generation, control/regulation systems, and electrical variable adjustment. It can solve problems such as inability to balance, poor tracking effect, and poor stability, reducing oscillation and eliminating steady-state oscillation. , the effect of improving power generation efficiency

Active Publication Date: 2021-11-26
GUANGXI UNIV +1
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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 to provide a fast state tracking variable step-length MPPT photovoltaic power generation stability control method. The present invention can stop the steady-state oscillation while maintaining the simple and easy-to-implement characteristics of the basic disturbance observation method And it has good tracking speed, which reduces the power loss caused by oscillation, improves the efficiency of the whole system, and can reduce the time for re-tracking the maximum power point. Problems with tracking maximum power point and keeping oscillations low in steady state

Method used

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  • Fast state tracking variable step size MPPT photovoltaic power generation stability control method
  • Fast state tracking variable step size MPPT photovoltaic power generation stability control method
  • Fast state tracking variable step size MPPT photovoltaic power generation stability control method

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Embodiment 1

[0055] Such as Figure 1 ~ Figure 2 As shown, under the same light and temperature conditions, the P-U curve of the photovoltaic cell is similar to a parabola, and the theoretical output voltage and output current of the photovoltaic cell can be any point on the I-U characteristic curve, and its actual output value depends on the external The load impedance; the maximum power point tracking technology is to adjust the resistance value of the external equivalent resistance through the control algorithm and the external circuit in different environments, so as to change the output voltage and output current of the photovoltaic cell, so that the photovoltaic cell can continue to maintain the maximum Power output, thereby improving the power generation efficiency of photovoltaic cells.

[0056] Such as image 3 As shown, a fast state tracking variable step size MPPT photovoltaic power generation stability control method includes the following steps:

[0057] S1, for the photovol...

Embodiment 2

[0094] Such as Figure 4 As shown, the model is mainly composed of photovoltaic array, Boost converter, load, energy storage lithium battery and MPPT controller; in the simulation process, the set temperature is 25°C, and the light intensity is 800W / m at the beginning 2 , from 800W / m in 1s 2 Jump to 1kW / m 2 , in order to explore more substantial light changes, from 1kW / m2 in 2s 2 Jump to 400W / m 2 .

[0095] Such as Figure 5 As shown, compared with the traditional P&O algorithm, the improved P&O algorithm used in the present invention can track the maximum power point faster, and there is basically no oscillation in the steady state, and the output power is also increased. After calculation, the maximum efficiency can reach 0.39 %, the improvement effect becomes more significant with the increase of light intensity.

[0096] Such as Image 6 It can be seen from the graph that the SOC of the energy storage battery increases nearly linearly from the initial 45% to 45.0042...

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Abstract

The invention discloses a fast state tracking variable step size MPPT photovoltaic power generation stability control method, which comprises the following steps of: firstly, realizing fast tracking of a maximum power point through variable step size, and stopping artificial disturbance and realizing non-oscillation stable output power after determining that a steady state is reached, so that power loss caused by oscillation is reduced, and the efficiency of the whole system is improved. When the external environment changes suddenly, the algorithm can detect the change of working conditions according to the sudden change of voltage and current values by using a three-point measurement method and reset parameters, so that the time for re-tracking the maximum power point is shortened, and the maximum power point tracking efficiency is improved while the basic characteristics of simplicity and convenience in implementation of a perturbation and observation method are kept. And steady-state oscillation can be stopped, and a good speed tracking effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and in particular relates to a fast state tracking variable step length MPPT photovoltaic power generation stability control method. Background technique [0002] In recent years, in order to cope with the depletion of fossil energy, environmental pollution and climate change, clean energy has attracted more and more attention from the international community. Since solar energy has the advantages of large total energy, easy development of resources, clean and pollution-free, etc., photovoltaic power generation technology is becoming the focus of research and utilization in various countries. [0003] Since the output characteristics of photovoltaic cells are affected by environmental conditions such as solar irradiance and temperature, and their volt-ampere characteristic curves are nonlinear; in order to improve the power generation efficiency of photovoltaic cells, we hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/67
CPCG05F1/67Y02E10/56
Inventor 郑含博杜齐胡永乐郭文豪覃团发
Owner GUANGXI UNIV