Two-stage photovoltaic grid-connected control system based on combination of pole allocation and repetitive control

Abstract

The invention relates to a two-stage photovoltaic grid-connected control system based on the combination of pole allocation and repetitive control, which can invert the direct current output by a photovoltaic cell into alternating current well and transmit the alternating current to a power system, so that the harmonic wave content is low, the power supply quality is good, the utilization ratio of a system is high, the stability of the system can be improved to a certain extent and the properties of the whole photovoltaic system are improved. The two-stage photovoltaic grid-connected control system based on the combination of pole allocation and repetitive control has the advantages that: (1) due to the adoption of numerical control, the antijamming capacity is high and the system can achieve high precision and stability; (2) the system has clear assignment, obvious control effect, reliability and high robustness, wherein a preceding-stage Boost converter can realize maximum power tracking; and a last-stage inverter achieves direct current side voltage stabilization and grid-connected inversion; and (3) a control algorithm is advanced, wherein a dead zone effect of the inverter and the harmonic wave caused by partial non-linear loads are avoided by a repetitive control technique; and precise control is realized through the state feedback-based pole allocation.

Description

【Technical field】 [0001] The invention is used in the solar grid-connected photovoltaic power generation industry, belongs to the interdisciplinary technical field of power electronics technology and control theory, and is particularly a two-stage photovoltaic grid-connected control system based on the combination of pole configuration and repetitive control. 【Background technique】 [0002] Energy is the material basis for human survival and development, which is related to national security and international status, and has always attracted attention. Today, with the shortage of fossil energy and the aggravation of environmental pollution, the utilization of renewable resources has attracted much attention, and solar energy has become the focus of people's utilization because of its universality, abundance and cleanliness. Photovoltaic power generation, one of the main utilization methods of solar energy, has developed rapidly. [0003] Photovoltaic power generation system...

AI Technical Summary

Problems solved by technology

However, the sliding mode control has the disadvantages that the ideal sliding mode switching surface is difficult to select, and the control effect is affected by the sampling frequency. It also has high-frequency jitter phenomenon, and the design needs to know the system uncertainty parameters and the limit of disturbance. The jitter makes the system unable to be accurate. Positioning, etc.

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