A current reference-enhanced strategy endows the GFC in DC microgrids better dynamic response
Wenqiang Xie, Xian Zheng, Mingming Shi, Jiaoxin Jia
TL;DR
This paper introduces a new strategy to improve the dynamic response of DC microgrids without increasing system bandwidth or adding noise.
Contribution
The novel non-integrator disturbance observer-based strategy enhances transient performance by replacing the integrator with load current feedback.
Findings
The proposed NIDOB strategy outperforms traditional methods in dynamic response.
The NIDOB strategy avoids noise issues associated with bandwidth-increased strategies.
Theoretical analysis and experiments confirm the effectiveness of the new approach.
Abstract
The constant voltage strategy (CVS) is more suitable for the small-capacity dc microgrid applications to form the dc bus voltage because it can eliminate the steady voltage deviation. However, its dynamic performance is slowed down by the integrator in the voltage loop and negatively influenced by the load steps. Some advanced methods have been conducted in the literature. However, their principle is to increase the system bandwidth, which is limited because the bandwidth is generally designed about one-tenth of the switching frequency and cannot be increased infinitely. This work pays efforts to increase the gain within the system bandwidth to accelerate the transient response and simultaneously eliminate the influence of the integrator. Therefore, the non-integrator disturbance observer-based (NIDOB) strategy is proposed in this work, and it can feed the load current into the current…
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Taxonomy
TopicsMicrogrid Control and Optimization · Advanced DC-DC Converters · Frequency Control in Power Systems