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Modified fuzzy sliding mode controlling method of monopole three-phase photovoltaic grid-connected system

A technology of fuzzy sliding mode control and fuzzy controller, which is applied in photovoltaic power generation, single-net parallel feeding arrangement, etc., to achieve the effects of overcoming the influence of nonlinear factors, fast dynamic response speed and strong robustness

Inactive Publication Date: 2009-12-16
SOUTHEAST UNIV
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Problems solved by technology

The time of the approach phase is very important, because only when the sliding mode quickly reaches the sliding surface within a limited time and slides on the sliding surface, the robustness of the sliding mode control will be fully displayed, and the integral sliding mode The response time of the controller in the initial start-up phase of the system, that is, the approach phase, needs to be further improved

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  • Modified fuzzy sliding mode controlling method of monopole three-phase photovoltaic grid-connected system
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  • Modified fuzzy sliding mode controlling method of monopole three-phase photovoltaic grid-connected system

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Embodiment Construction

[0028] The present invention is specifically realized through the following technical solutions:

[0029] 1) Detect the A, B, and C three-phase voltage signals of the mains power grid, and calculate the grid voltage vector rotation angle θ through the phase-locked loop PLL method, and use the rotation angle θ and the A, B, and C three-phase voltage signals of the grid to calculate the power grid Voltage d, q-axis DC component e d 、e q ;

[0030] 2) Detect the three-phase current signals of the inverter output terminals A, B, and C, and use the rotation angle θ in step (1) to perform dq rotation vector transformation to obtain the DC current component i in the synchronously rotating dq axis coordinate system d i q ;

[0031] 3) Detect the output voltage U of the photovoltaic array pv and current I pv , using the commonly used maximum power point tracking MPPT method--perturbation and observation method, to obtain the reference voltage U of the maximum power point of the p...

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Abstract

The invention relates to a modified fuzzy sliding mode controlling method of a monopole three-phase photovoltaic grid-connected system, belonging to the control technical application field of a photovoltaic grid-connected system; the method has the advantages of strong robustness, good stability and rapid dynamic response speed; the method comprises the following steps particularly: firstly, feedforward compensation is led in to rapidly compensate the coupling part of d, q shaft current id and iq which are output by an inverter, thereby realizing rapid dynamic decoupling between id and iq; secondly, by controlling reaching law of lead-in index of an integral sliding mode controller, the dynamic performance of a sliding mode controlling system is improved, the response speed of the system at the initial starting stage is accelerated, and a system state trajectory is ensured to rapidly and smoothly enter in a sliding mode surface to move, wherein the sliding mode surface has good robustness to system interference; finally, a fuzzy control is led in to weaken the buffeting of common sliding mode control in the sliding mode surface, the output of the sliding mode controller is softened, and the stability of the system is improved.

Description

technical field [0001] The invention relates to a fuzzy sliding mode control method for a single-stage three-phase photovoltaic grid-connected system, belonging to the application field of photovoltaic power generation system control technology. Background technique [0002] For photovoltaic grid-connected systems, the most important issue is how to improve the power generation efficiency of the system and the working stability of the entire system. Since the single-stage photovoltaic grid-connected system has only one energy conversion link, the system has a simple structure, high efficiency and stability, and has become a research hotspot at home and abroad. Generally, its control system adopts multi-loop control, that is, firstly, the maximum power point tracking MPPT method, such as the commonly used disturbance and observation method at present, gives the reference voltage U of the maximum power point of the photovoltaic array ref , and then control the output voltage ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/563Y02E10/56
Inventor 郑飞费树岷周杏鹏刘庆全
Owner SOUTHEAST UNIV
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