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Voltage-controlled inverters have been widely used in distributed generation due to their flexibility and smooth transition between grid-connected and islanded modes. However, in the grid-tied mode, the inherent coupling between active and reactive power will challenge the independent control of active power and reactive power, and therefore deteriorate system performance. To deal with this issue,...
Focus is on three operation strategies for a grid-connected three-level neutral-poi n t-clamped quasi impedance source inverter in a single-ph as e application. Each control scheme wa s implemented in the PS CAD/EMTDC simulation tool a n d underwent different tests, which involved some steps in the reference values and in the perturbations applied to the system. A comparison according to their responses...
As one of the forefront topics in the study of electrical engineering, microgrid can provides a new technical method for large scale application of new energy and renewable energy intergration. Microgrid can not provide flexible operation modes and high quality power supply services without thorough and stable control system, and the independent active and reactive power control is a important question...
This paper investigates the problem of appropriate load sharing in an autonomous distribution-level microgrid, where the considerable resistive component of the line impedance makes the conventional frequency and voltage droop controls impractical. To improve active and reactive power sharing, a power control strategy is proposed which contains a virtual inductor at the interfacing inverter output...
This paper presents the optimized control of a three-phase grid connected inverter, considering as basis of analysis the observation of the dynamics of the system with two inputs and two outputs (TITO SYSTEM). This model allows the design of the inverter control in a direct way, by means of two PI controllers to control the instantaneous active and reactive power. By means of the control of the instantaneous...
With the increasing concerns for the traditional energy shortage and environment issues, distributed generation (DG) systems based on renewable energy sources (RES) have experienced a fast development in recent years. With more DG units being integrated into the power system, a more recent concept, called microgrid, is developed by grouping a cluster of loads and parallel DG units in a local area...
In order to expand the wind energy capture range, promote its global efficiency and fault tolerance and reduce its cost, a new direct-driven wind energy conversion system with multiple armature-winding hybrid-excitation generator is presented in this paper. The structure of the generator is described. Both operating principles and control strategies of the system are analyzed in detail. With the accurate...
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