Microgrid system having distributed power supply and control method thereof

Abstract

The invention discloses a microgrid system having a distributed power supply. The system comprises an improved PQ control module and a Droop control module. The improved PQ control module is formed by an input / output module, a phase-locked loop module, a dq conversion module, a current inner loop control module and a power outer loop control module. The Droop control module is formed by a dq conversion module, a power calculation module, a power control module and a voltage and current double-loop control module. Through research and analysis, the invention provides a control method of the microgrid system having the distributed power supply based on PQ control, and carries out simulative analysis; the phase-locked loop module established in the PQ control module has good feedback and synchronization performance; an inner loop adopts PI control, thereby greatly improving control performance of the current loop and the power loop; and through the Droop control module, P-V and Q-f control characteristics are met, microgrid island operation and adjustment are participated in effectively, and control requirements of a microgrid can be met.

Description

technical field [0001] The invention relates to the technical field of chemical catalysts, in particular to a microgrid system with distributed power sources and a control method thereof. Background technique [0002] With the continuous expansion of the scale of the power grid and the continuous improvement of the voltage level, the excessive use of energy and the frequent occurrence of environmental problems, the disadvantages of the operation of the power system for large-scale transmission, transformation and distribution of long-distance and the stability of the power grid are becoming more and more frequent. It is concerned that traditional power construction and maintenance costs are high, operation is difficult, and it is difficult to meet users' diverse power supply needs and reliability and safety requirements. Based on this, distributed power generation technology emerged as the times require. Distributed power has many advantages and meets the needs of energy dis...

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Problems solved by technology

[0003] Although the advantages of distributed power are outstanding, its disadvantages are also obvious. First, distributed power has the characteristics of random fluctuations, and the single-machine access cost of distributed power is high and difficult to control. The connection of distributed power to the grid will cause voltage and The fluctuation of frequency leads to the decline of the power supply quality of the large power grid; secondly, due to the uncontrollability and randomness of the distributed power supply, once the power grid fails, the distributed power supply must be disconnected from the large power grid immediately, and the distributed power supply access and exit The short-term huge changes in the output power of distributed power sources will cause voltage flicker problems, etc.

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