Abstract
This study proposes a hierarchical control structure for a smooth transition of multi-bus microgrids from islanded mode to grid-connected mode. The proposed control structure uses an average consensus protocol for the secondary control layer and Andronov-Hopf virtual oscillator control as a primary controller. The proposed method enhances the power-sharing accuracy among DGs in normal operation. A synchronization strategy is embedded into the secondary control layer in synchronization mode to force the MG-side voltage at the connection point to synchronize with the grid-side voltage. The influence of the secondary controller and communication time-delay on system stability and performance is analyzed with small-signal analysis. The proposed method is validated via control-hardware-in-the-loop (CHiL) using a real-time Opal-RT platform.
Highlights
The growth of economic and environmental concerns is pushing the conventional centralized power systems to evolve toward a distributed, local paradigm with innovative business models
This paper presents the design of an autonomous synchronization method for the multi-bus MG controlled with virtual oscillator control (VOC), which is based on an average consensus distributed protocol (CDP)
The main contributions of this paper are as follows: i) an average consensus distributed protocol that uses only a spare communication network is proposed to achieve the load power-sharing among distributed generation (DG) and autonomous synchronization simultaneously; the problem related to single-point failure no longer exists, ii) An improvement of the AndronovHopf Oscillator (AHO) [9] is presented to control DGs in both islanded and grid-connected multi-bus MG, and iii) the proposed synchronization framework does not require direct frequency and phase angle measurement to track magnitude, frequency, and phase angle of the grid voltage
Summary
The growth of economic and environmental concerns is pushing the conventional centralized power systems to evolve toward a distributed, local paradigm with innovative business models. This paper presents the design of an autonomous synchronization method for the multi-bus MG controlled with VOC, which is based on an average consensus distributed protocol (CDP). The main contributions of this paper are as follows: i) an average consensus distributed protocol that uses only a spare communication network is proposed to achieve the load power-sharing among DGs and autonomous synchronization simultaneously; the problem related to single-point failure no longer exists, ii) An improvement of the AndronovHopf Oscillator (AHO) [9] is presented to control DGs in both islanded and grid-connected multi-bus MG, and iii) the proposed synchronization framework does not require direct frequency and phase angle measurement to track magnitude, frequency, and phase angle of the grid voltage. The detail of these control signals and corresponding modifications of the CDP control laws are presented
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