Abstract
The secondary control of microgrids (MGs) normally relies on the communication network to exchange information. Communication delay is an inherent characteristic during the signal transmission process, which may deteriorate the system dynamic performance and even destabilize the system. This paper studies the impact of communication delay on the small-signal stability of MGs with distributed secondary frequency and voltage control, and further investigates the corresponding delay compensation method. First, a time-delayed small-signal dynamic model of MGs considering both distributed secondary frequency and voltage controllers is developed. Based on the model, a comprehensive delay-dependent stability analysis is performed to reveal how the amount of communication delay, the topologies of communication networks, and the values of control parameters affect the system stability. Subsequently, a delay compensator based on lead-lag compensation along with gain regulation block is designed to enhance the system stability against the communication delay. Finally, time-domain simulation and experimental results are presented to validate the effectiveness of the proposed methods.
Highlights
With the increasing integration of renewable energy sources in the distribution network, the concept of microgrid (MG) is a viable technical option to systematically organize theThe associate editor coordinating the review of this manuscript and approving it for publication was Bohui Wang.distributed generation (DG) units and promote their local consumption
Compared with [11]–[14], [19]–[24], this paper provides a comprehensive delay-dependent stability analysis for the distributed secondary frequency and voltage control of MGs based on the constructed small-signal dynamic model to (i) study the effect of communication delay on the damping and oscillation frequency of system’s dominant oscillatory modes, (ii) identify the delay margin with respect to different communication network topologies and control parameters, and (iii) provide beneficial references for the control parameter tuning besides its primary consideration of system dynamic performance requirement;
Unlike [11], [25] which perform time delay compensation for the centralized secondary control, this paper presents a delay compensator for the distributed secondary control based on lead-lag compensation along with gain regulation block to enhance the system stability against communication delays
Summary
With the increasing integration of renewable energy sources in the distribution network, the concept of microgrid (MG) is a viable technical option to systematically organize the. Motivated by the aforementioned limitations, this paper studies the communication-delay-related stability problem for the distributed secondary frequency and voltage control of islanded MGs, and presents integrated modeling, analyzing and compensating method. Compared with [11]–[14], [19]–[24], this paper provides a comprehensive delay-dependent stability analysis for the distributed secondary frequency and voltage control of MGs based on the constructed small-signal dynamic model to (i) study the effect of communication delay on the damping and oscillation frequency of system’s dominant oscillatory modes, (ii) identify the delay margin with respect to different communication network topologies and control parameters, and (iii) provide beneficial references for the control parameter tuning besides its primary consideration of system dynamic performance requirement;. Ni is set in inverse proportion to the reactive power capacity Qimax of DG units, i.e., n1 : n2 :
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