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Large-scale integration of distributed generations (DGs) may degrade the stability of the power distribution system. This paper proposes a control method to improve the system stability of grid-connected inverter-based distributed generation (DG) systems. The proposed method is to add a stabilizer inside the inverter interface controller of a DG unit to supply auxiliary current reference signal for...
Planning the expansion of distribution systems (DS) is a nonlinear and combinatorial problem that combines technical and regulatory constraints. Commonly, the planning of DS is intended to achieve a radial topology to reduce its complexity. However, in a smart-grid context, distribution feeders are subject to reconfigurations to transfer load between feeders in failure events, or to compensate for...
In this paper, a trajectory sensitivity method (TSM) is used to estimate parameters of a synchronous generator model suitable for unbalanced conditions which are typical of distribution systems. The current formulation and mechanical equations which represent the synchronous machine have parameters whose value modification cause significant changes in system's output. Trajectory sensitivity method...
This paper presents the analysis of a distribution system subject to reconfiguration with high wind penetration over a period of 24 hours. In order to meet this objective, the reconfiguration problem is solved through mixed integer linear programming considering the stochasticity of the variables, where the balance between load and generation has to be satisfied at the lowest cost in each period....
Given the relatively new context in which Distributed Geeneration (DG) is inserted in distribution systems, for certain aspects of the operation of this type of system there are relatively few studies of power quality considering the presence of DG. One of these aspects is certainly the possibility of DG operating under unbalanced three-phase operating conditions, which is quite common in distribution...
The distribution generation and demand response remuneration practices, used by most aggregation entities, considers simple characteristics as the type of resource. This evaluation may cause a non optimized tariff definition in most cases. For this paper, a Virtual Power Player as aggregator is considered, which is able to make clusters of both producers and consumers. The proposed methodology defines...
This paper proposes game theory method to solve the multi-objective optimal operation problem of microgrid. By converting the initial objects into game players and the functions to utility functions and with the help of impact factor and cluster the variables are converted to strategies of every player. By solving the new game theory problem we get an equilibrium result which can take all objects...
This paper describes generic models of photovoltaic (PV) systems developed for implementation in Western Electric Coordinating Council (WECC) base cases. The scope encompasses both transmission-connected, central station PV plants and distributed PV systems. These models were added to the WECC Approved Dynamic Model Library in March of 2014.
The objective of this research is to evaluate the performance of a Power System Stabilizers (PSS), designed using a formulation based on Linear Matrix Inequalities (LMIs), in an Electric Power Distribution System (EPDS) with distributed synchronous generators operating under unbalanced three-phase. Under these conditions, the steady-state operation of the EPDS is not an equilibrium point, which introduces...
Distributed Generation (DG) units have many benefits and have been extensively used for loss reduction and voltage improvement. This paper proposes a simple, yet efficient method for long term planning using DG units and line reinforcement. The proposed method uses a dynamic graph to identify the optimal combination of buses to which DG units connect and/or lines to be upgraded in order to mitigate...
This paper discusses the possibilities and the merits of adopting a DC microgrid strategy for enhancing the economics and the resilient operation of the distributed generation systems, and tests the proposed hierarchical control strategy that applies to a DC microgrid based on an existing microgrid at Illinois Institute of Technology (IIT). The simulation results are compared with those of an AC microgrid...
A traveling wave fault location method based on multi measuring points for distribution network with distributed generation is proposed in this paper. A novel fault location algorithm based on the time difference between the first aerial-mode and zero-mode wave-fronts of the traveling wave are used to obtain the preliminary fault location without the wide area precision time synchronization. This...
In this paper a hybrid method is proposed to reduce the impact of islanding in the presence of Distributed Generation (DG). The issue of islanding is critical in the distribution system as the non- detection of islanding may lead to the collapse of the system. The islanding is prominent due to the increased penetration levels of DG in the network. In the proposed method, first the placement of DG...
A large number of distributed generations (DGs) in a distribution grid always belong to different operators. Therefore, the exact changes in operation state caused by each single DG, such as the allocation of power loss, should be determined. This study proposes a method combining power flow algorithm, sensitivity analysis, and multi-step integration. The total changes caused by all the DGs can then...
The performance of passive islanding detection techniques, such as frequency-based and voltage-based relays are affected by the active and reactive power imbalance and by the voltage dependence of the system loads. The combination of the load variation at different nodes of the power distribution grid with the DG power output can create similar power imbalance scenarios but with different voltage...
The increasing penetration of renewable/distributed sources with non-linear characteristics demands a clear methodology for determining the amount of generation which can be connected to the system without deteriorating the performance (the “hosting capacity”). This paper proposes a methodology for determining the hosting capacity regarding harmonic distortions. To exemplify an application of the...
Since its introduction, distributed generation (DG) has surely allowed the exploitation of otherwise unrecoverable energy resources dispersed on the territory, though posing a series of as yet unsolved problems connected to smart grid operation. One of these inconveniences is the automatic DG disconnection in weak network. Actually, for a DG system to be able to inject power into a grid, the voltage...
Harmonic distortion on voltages and currents increases with the increased penetration of Plug-in Electric Vehicle (PEV) loads in distribution systems. Wind Generators (WGs), which are source of harmonic currents, have some common harmonic profiles with PEVs. Thus, WGs can be utilized to subside the effect of PEVs on harmonic distortion. This paper studies the impact of PEVs on harmonic distortions...
In recent years the integration of renewable energy sources to distribution system is gaining attention worldwide. However, the intermittent nature of renewable sources creates challenges in integration of Distributed Generation (DG) units. In this paper, a Genetic Algorithm (GA) based methodology has been proposed for optimal penetration of different types of renewable DG units in the distribution...
This paper introduces the application of Taguchi method to find the optimal allocation of distributed generations (DGs) in distribution network to minimize feeder power losses. The proposed method employs an orthogonal array (OA) to obtain optimal siting and sizing of DGs. The factors of OA are tuned by executing factorial design of experiments iteratively to optimize the objective function. The developed...
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