Journal
IEEE TRANSACTIONS ON SMART GRID
Volume 9, Issue 5, Pages 5444-5454Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TSG.2017.2769675
Keywords
Disturbance observer (DOB); grid-connected; hierarchical control; islanding; microgrid; seamless transition
Categories
Funding
- National Key Research and Development Program of China [2016YFB0900400]
- National Science Foundation of China [51477029]
- Scientific Research Foundation of the Graduate School of Southeast University [YBJJ1729]
- Cooperative Innovation Fund of Jiangsu Province-the Prospective and Joint Research Project [BY2015070-18]
- U.S. Department of Energy's Office of Electricity Delivery and Energy Reliability
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A generalized hierarchical structure is proposed for inverter-interfaced distributed generation in a microgrid that enables both grid-connected and islanding modes with no need of forced switching between district controllers. The proposed control scheme consists of a fixed voltage reference generation algorithm and a modified voltage-current controller, where the former is based on droop technique to accommodate all operation modes, and the latter aims for an offset-free voltage control. To improve the control dynamics of the well-accepted cascaded voltage-current method, a disturbance observer based feedforward scheme is proposed by introducing the estimation of fluctuations into the reference of the inner current loop, which does not need remote measurements and communication in existing schemes. Based on the proposed strategy, disturbance effects both in structure and external power are remarkably attenuated. Details on the design of the observer and controllers as well as the robustness and sensitivity to parameter perturbation are provided. The effectiveness of the control scheme is verified by the simulations of an island demonstration project and experimental results.
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