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    Towards a hierarchical and distributed power management framework for SGs
    (IEEE, 2023-11-16) Nleya, Bakhe; Shezi, Nokwanda
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    Advanced distributed cooperative secondary control of Islanded DC Microgrids
    (MDPI AG, 2022-05-28) Aluko, Anuoluwapo; Buraimoh, Elutunji; Oni, Oluwafemi Emmanuel; Davidson, Innocent Ewean
    In an islanded DC microgrid with multiple distributed generators (DGs), the droop control is employed to realize proportional current sharing among the DGs in the microgrid. The action of the droop control causes a deviation in the DC bus voltage which is exacerbated by the line impedance between the DG and the DC bus. In this paper, an advanced distributed secondary control scheme is proposed to simultaneously achieve accurate voltage regulation and cooperative current sharing in the islanded DC microgrid system. The proposed distributed secondary controller is introduced in the cyber layer of the system, and each controller shares information with neighbouring controllers via a communication network. The distributed technique maintains the reliability of the overall system if some part of the communication link fails. The proposed controller uses the type-II fuzzy logic scheme to adaptively select the secondary control parameters for an improved response of the controller. The sufficient conditions to guarantee the stability of the proposed controller are derived using the Lyapunov method. Comprehensive tests under different operating scenarios are conducted to demonstrate the robustness of the proposed control scheme.
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    Guiding principles for grid code compliance of large utility scale renewable power plant intergration onto South Africa's transmission/distribution networks
    (IEEE, 2016-11) Sewchurran, Sanjeeth; Davidson, Innocent E.
    Renewable energy generation technologies with its short lead times have become an attractive alternative to assist South Africa to solve its energy crisis and hence led to the Government calling upon Independent Power Producer to enter the market. Subsequently, the Integrated Resource Plan 2010 set a target of 17 800 MW (equivalent to 42%) of new electricity generation capacity in the country to be derived from renewable energy sources. The South African Renewable Energy Grid Code was then published in 2010 to assist with safe and technical integration of these plants into the South African grid. Electricity utilities are now faced with the task to understand the code and carry out testing of these renewable power plants in order to certify them grid code compliant. This paper assists by discussing the requirements of the South African Renewable Energy Grid Code Version 2.8 with testing methods to check grid code compliance.