Distributed micro-grid control strategy considering disturbance influence

Abstract

The invention discloses a distributed micro-grid control strategy considering disturbance influence. Designing a network layer and physical layer control structure; designing a sliding mode consistency controller with a virtual leader node based on a sliding mode control-discrete consistency theory; constructing a physical layer, completing one-time control of voltage and frequency of each distributed power supply of the microgrid, completing droop control through local information, maintaining stability of voltage and frequency of the system, and outputting corresponding power according to an instruction; constructing a network layer to complete distributed secondary control, regarding each distributed power supply as a multi-agent node, only communicating with adjacent nodes to form a spanning tree sparse communication matrix, and setting a virtual leader node to obtain global reference information; the droop control output voltage frequency of each distributed power supply is regarded as a state quantity, and secondary control is designed to realize convergence of the voltage frequency to a given reference value. The communication requirement is reduced, the frequency voltage deviation is eliminated, the system disturbance condition is considered, and the system robustness is improved.

Description

technical field [0001] The invention belongs to the field of distributed micro-grid control, and relates to a distributed micro-grid control strategy that considers the influence of disturbance in the case of discrete sampling. Background technique [0002] With the widespread application of distributed generation (DG), microgrid control technology has attracted much attention. The traditional centralized secondary control transmits the data of each DG unit to the central processing unit for processing and calculation. This control method is susceptible to single point failure, low communication reliability, and poor flexibility and scalability. The distributed control method based on the multi-agent consensus protocol utilizes the communication between each DG unit and adjacent nodes to achieve global information sharing. Each DG unit has synergy, requires less communication pressure, and preserves the flexibility of the microgrid. [0003] Disturbance and system uncertai...

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is: in the primary control of the microgrid, because the droop control is differential adjustment, the traditional centralized secondary control is easily affected by single point failure, and the communication reliability is low, a distributed secondary control is proposed. The control strategy reduces communication requirements and eliminates frequency and voltage deviations, while considering system disturbances to improve system robustness

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