Active time delay compensation cooperative control method based on distributed inverter system

Abstract

The invention provides an active time delay compensation cooperative control method based on a distributed inverter system. A plurality of inverter communication control units are included. According to the method, an inversion communication control unit obtains three-phase inversion voltage, three-phase inversion current, three-phase filtering voltage and three-phase filtering current at the moment k through collection and analog-to-digital conversion. D-q conversion is performed on the three-phase filtering voltage and current delayed by tau to calculate reactive power at the (k-tau) th moment, a voltage coupling control factor and a reactive power coupling control factor are calculated, a coupling error factor is obtained, and a compensation controller model is constructed. A cooperative controller model is constructed by combining the cooperative control quantity of the compensation controller with the coupling error factor. Finally, a discrete prediction model is constructed, and an inverter control signal at the next moment is obtained through multiple iterations. The method has the advantages that when communication delay exists, the control method can actively compensate delay, eliminate voltage deviation and achieve accurate reactive sharing.

Description

technical field [0001] The invention belongs to the field of micro-grid operation control, in particular to an active time-delay compensation cooperative control method based on a distributed inverter system. Background technique [0002] Microgrid is a promising solution for efficient integration of distributed generators, loads and storage units through DC / AC inverters. Voltage frequency stability and power sharing are two important tasks for microgrids. On this basis, maintaining system stability and reasonable power sharing is the prerequisite for the economical and efficient operation of microgrids. Therefore, a variety of hierarchical control structures are introduced into the microgrid, including primary control, secondary control, and tertiary control. [0003] Droop control, which is a commonly used decentralized method to achieve primary control to achieve power / load sharing and voltage stabilization. Although the method based on droop control is simple to opera...

AI Technical Summary

Problems solved by technology

If these unreliable factors are not handled properly, the coupling delay in the communication network will endanger the operation of the system, and even affect the reliability and stability of the system

However, most of the control methods are passive to solve the communication delay problem. Therefore, it is necessary to design a distributed controller that solves the inherent defect problem based on droop control and actively compensates the delay problem caused by the communication network. Synergistic control is conducive to improving the robustness of microgrid control and exerting the economic and environmental benefits of renewable energy.

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