Abstract
This work considers the problem of decentralized control of inverter-based ac micro-grid in different operation modes. The main objectives are to (i) design decentralized frequency and voltage controllers, to gather with power sharing, without information exchange between microsources (ii) design passive dynamic controllers which ensure stability of the entire microgrid system (iii) capture nonlinear, interconnected and large-scale dynamic of the micro-grid system with meshed topology as a port-Hamiltonian formulation (iv) expand the property of shifted-energy function in the context of decentralized control of ac micro-grid (v) analysis of system stability in large signal point of view. More precisely, to deal with nonlinear, interconnected and large-scale structure of micro-grid systems, the port-Hamiltonian formulation is used to capture the dynamic of micro-grid components including microsource, distribution line and load dynamics as well as interconnection controllers. Furthermore, to deal with large signal stability problem of the microgrid system in the grid-connected and islanded conditions, the shifted-Hamiltonian energy function is served as a storage function to ensure incremental passivity and stability of the microgrid system. Moreover, it is shown that the aggregating of the microgrid dynamic and the decentralized controller dynamics satisfies the incremental passivity. Finally, the effectiveness of the proposed controllers is evaluated through simulation studies. The different scenarios including grid-connected and islanded modes as well as transition between both modes are simulated. The simulation conforms that the decentralized control dynamics are suited to achieve the desired objective of frequency synchronization, voltage control and power sharing in the grid-connected and islanded modes. The simulation results demonstrate the effectiveness of the proposed control strategy.
Highlights
In recent years, renewable energy systems have been increasingly employed to mainly reduce the cost of energy prices and solve the environmental issues
9 Conclusion The problem of decentralized control of inverter-based ac micro-grid in different operation modes is addressed in this work
We focus on the problem of decentralized frequency and voltage control of the microgrid system without information exchange between the microsources
Summary
Renewable energy systems have been increasingly employed to mainly reduce the cost of energy prices and solve the environmental issues. Numerous methodologies have been proposed to enhance the microgrid stability performance via modifying the inverter control loops [44,45,46,47,48] These techniques and methods include a combination of repetitive and deadbeat control with feedforward compensation for disturbance rejection [46], secondary control based on potential-function [47], real-time small signal stability analysis for droop gain schedule [45] and droop gain variation for increasing virtual inertia [48]. Authors aim to model the microgrid components and propose new decentralized passivity-based control strategy for an microgrid consisting microsource units and local loads based on port-Hamiltonian framework, shifted-energy function, and incremental passivity to ensure stability of the entire system and enhance its performance for transition between grid-connected to islanded modes and guarantee the desired frequency synchronization, voltage tracking as well as power sharing.
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