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Passive damping control method and system of single-phase LCL grid-connected inverter

A passive damping and control system technology, applied in the electrical field, can solve problems such as affecting the high frequency characteristics of the system

Inactive Publication Date: 2018-06-29
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] Due to the continuous improvement of the performance of the digital signal processor (Digital Signal Processing, DSP), the control method is more flexible, and the grid-connected inverter mostly adopts digital control, but the digital control will bring a delay of 1.5 beats to the system, affecting the system performance. High frequency characteristics

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[0073] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus their repeated descriptions will be omitted.

[0074] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the present disclosure. However, those skilled in the art will appreciate that the technical solutions of the present disclosure may be practiced without one or mo...

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Abstract

The invention discloses a passive damping control method and system of a single-phase LCL grid-connected inverter. The method comprises steps as follows: an established mathematical equation is converted into an open-loop transfer function of the single-phase LCL grid-connected inverter, the open-loop transfer function of the single-phase LCL grid-connected inverter is decomposed into a form of aproduct of an LCL filter model, a delay link model and a current regulator model, each link Bode image is drawn, the system stability is analyzed according to the open-loop transfer function of the control system and each link Bode image, system current regulator parameters are designed after constraint conditions calculated according to a nyquist diagram are added to the design of LCL filter parameters, and passive damping control of the single-phase LCL grid-connected inverter is realized. The system stability can be improved under the influence of delay of a digital system, damping controlis not required, additional sensors are not required, and the hardware cost of the control system is reduced.

Description

technical field [0001] The present disclosure relates to the field of electrical technology, in particular, to a passive damping control method and system for a single-phase LCL type grid-connected inverter. Background technique [0002] As the distributed power generation method is generally recognized by the society, the utilization rate of single-phase low-power power generation and energy storage systems is increasing, and there are more and more researches on single-phase grid-connected inverters. The grid-connected inverter is used as a channel for energy exchange between the power generation and energy storage system and the grid, and its control technology affects the power quality of the grid. Grid-connected current total harmonic distortion (Total Harmonic Distortion, THD) is an important indicator for evaluating the performance of grid-connected inverters. The grid-connected standard stipulated in IEEE Std 1547-2003 requires that THD should not exceed 5%. In orde...

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Application Information

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IPC IPC(8): H02J3/38H02M7/5387
CPCH02J3/38H02J2203/20H02M7/5387
Inventor 周京华章小卫陈亚爱宋晓通温春雪胡长斌朴政国张贵辰曹靖
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY
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