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In this paper we study stability of a power system consisting distributed generation units. A complete model for the power grid including dynamics of loads as well as interchange of power is taken into account. A cooperative secondary control scheme takes into account internal dynamic of each node and is implemented to improve the stability of the system. In this paper, a condition for the stability...
Distributed generation systems have been widely implemented in power systems all over the world, and so have the non-linear loads. Then, it is worthwhile to analyze the possibility of providing these generation systems with power conditioning functionalities. In these terms, this work presents a DFIG-based wind power distributed generation system with active filtering and utility voltage regulation...
This paper presents a new concept of co-ordinated active power sharing between shunt and series converters of unified power quality conditioner (UPQC) for distributed generation applications. Normally, the UPQCs are used to mitigate both voltage and current power quality problems. However, these UPQCs are also used for delivering active power in addition to its power quality improvement by integrating...
Grid background harmonics may be amplified, propagate through a long distribution feeder and even lead to power system instability. In this paper, harmonic propagation issue is investigated and mitigation of the harmonics is analyzed by using transmission line theory which has already been applied in power systems. It is demonstrated that a specific harmonic will not be amplified if the feeder's length...
During the past few years, microgrids (MGs) have been becoming more attractive as effective means to integrate different distributed energy resources (DERs). To coordinate active and reactive power sharing among DERs, conventional droop control method is widely used as a decentralized control scheme. However, sharing powers among the sources based on the units' rated capacities is not an optimal solution...
Integrated control of meshed power grids with multiple feeding points and distributed power sources has a great potential to increase safety, efficiency, quality, and flexibility of grid operation, by taking advantage of inherent control capabilities of distributed power sources. This paper describes a generalized approach to integrated control, which can be applied irrespective of grid topology,...
Microgrid is regarded as a new form to integrate the increasing penetration of distributed generation units (DGs) in the extensive distribution systems. This paper proposes an adaptive overcurrent protection strategy for a microgrid network. The protection coordination of the overcurrent relays is treated as a linear programming problem for the different operation states. In the control center, an...
This paper presents a coordination secondary control strategy for autonomous hybrid AC/DC microgrids with global power sharing operation. In the previous work, primary control with droop control method was applied to distributed generators to ensure local power sharing without communication links in either ac or dc microgrid. An extension of local power sharing for individual microgrid is the global...
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