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Maximum power point tracking method based on disturbance observation

A technology of maximum power point and disturbance observation, applied in photovoltaic power generation, instrumentation, regulating electrical variables, etc., can solve the problems of output power oscillation, bus voltage collapse, poor control strategy stability, etc., and achieve the effect of small steady-state tracking error

Inactive Publication Date: 2013-12-18
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a maximum power point tracking method based on disturbance observation, which solves the problems of poor control strategy stability and bus voltage collapse or output power oscillation in the traditional disturbance observation method in single-stage photovoltaic grid-connected systems, and Unaffected by algorithmic digitization

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Embodiment Construction

[0033] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0034] When the maximum power point tracking algorithm is implemented in a digital form, the digitalization of some algorithms will have some impact on the performance of the maximum power point tracking, and in some cases it will even make the maximum power point tracking invalid. Without considering the noise interference, Quantization error is one of the reasons for the failure of digital maximum power point tracking algorithm.

[0035] The digital sampling resolution of voltage and current can be expressed as:

[0036] r v = V ms 2 N c and r i = I ms ...

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Abstract

The invention discloses a maximum power point tracking method based on disturbance observation. The method comprises the steps of firstly, sampling a photovoltaic array voltage, a grid voltage and a grid-connected current signal; then, establishing a dynamic model of a single-stage photovoltaic grid-connected generation system; finally, carrying out maximum power point tracking on the single-stage photovoltaic grid-connected generation system. According to the method, only the photovoltaic array voltage is detected, and a grid-connected reference current amplitude signal Iref is taken as an equivalent signal of output power of a grid-connected inverter, so that the influence on a maximum power point tracking algorithm caused by sampling quantization errors is lowered effectively, and the problems of the traditional disturbance observation methods that in the single-stage photovoltaic grid-connected generation system, the stability of the control strategy is poor and the bus voltage collapses or the output power oscillates are solved.

Description

technical field [0001] The invention belongs to the technical field of solar distributed renewable new energy power generation, and relates to a maximum power point tracking control strategy suitable for a single-stage photovoltaic grid-connected power generation system, in particular to a maximum power point tracking method based on disturbance observation. Background technique [0002] The output power characteristics of photovoltaic cells are highly nonlinear. The maximum output power and the voltage and current at the maximum output power point vary with factors such as temperature, light intensity, and light imbalance. Only by adopting an effective maximum power point tracking algorithm can the photovoltaic power generation system improve the utilization rate of photovoltaic cell module electric energy. [0003] At present, there are many methods for realizing maximum power point tracking in photovoltaic power generation systems: constant voltage method, disturbance obs...

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Application Information

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IPC IPC(8): G05F1/67
CPCY02E10/56
Inventor 张琦孙向东郭列安少亮任碧莹杨慧
Owner XIAN UNIV OF TECH
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