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In the last decade, harmonic analysis of Japanese middle voltage (MV) customer and low voltage (LV) customer has been done, the distribution of the fifth harmonic current can be classified MV customer's single phase load, LV customer's three phase and single phase load named group A and MV three phase load named group B, and the amplitude per load kW has been investigated from sum of each current...
Modeling and simulation of power systems for general-purpose transient studies has been receiving significant attention in the literature. Among recently proposed methods, the so-called shifted-frequency analysis (SFA) approach has been shown to facilitate accurate and numerically efficient simulation of electromagnetic and electromechanical transients with the use of dynamic phasors. This paper proposes...
In view of China's national conditions, this paper put forward a novel strategy for the maximization of renewable energy consumption, with collaborative controlling between the transmission network and the distribution network. This strategy took the local distribution network as a flexible and adjustable electric source, which played an active role in the consumption activity of the large-scale renewable...
This paper presents a model to optimally select and operate energy storage devices attached to renewable energy generators connected to power distribution systems. The purpose is to supply a load during specific periods, considering the intermittence of the renewable energy resources and variable electricity rates. Thus, it was developed a database containing information obtained from catalogs of...
In this paper, a Mixed Integer Linear Programming (MILP) based rolling optimization approach under real time pricing (RTP) policy is introduced to efficiently manage energy consumption of a smart home equipped with a Battery Energy Storage System (BESS) and a solar PV system. Models of distributed energy resources (DERs) in a smart house are developed and accordingly optimal management of total energy...
Frequency control from the demand side presents a novel and viable way to complement control by traditional generators. This paper presents practical guidelines for system operators to select gain settings for a proposed frequency-based load control strategy. Simulation tests in a large interconnected system model demonstrate the robustness to different values of control gains, and sensitivities to...
This study investigates the impacts of Plug-in Electric Vehicles (PEV) on end-service local distribution feeders. The results show that the PEV charging depresses the feeder voltages significantly and increase the feeder power losses up to 16.7 times. The voltage stress is more profound at the end of the feeder or at the point where many PEV are connected. The most noticeable impact of the PEV is...
This paper aims to develop a management method considering load demand for electric vehicle charging. The method developed by means of modeling a stochastic distribution of charging and a demand dispatch calculation. Optimization processes have proposed to determine optimal demand shifting so that charging costs and demands can possibly be managed. The time of use electricity rate has been put into...
Daily trip distance and end time of the last trip are two essential variables for home based electric vehicle (HBEV) charging load model. A non-parametric Gaussian kernel density estimation method is proposed to build the probability density distributions of these two variables. This method can improve the precision and adaptability of the distributions compared with parametric estimation. A Latin...
One of the challenges in future energy systems is the massive use of high power converters that decouple new energy sources from the AC power grid, disabling natural frequency response. This situation decreases the total system inertia affecting the ability of power system to overcome system frequency's disturbances. It has been established by the wind power industry a controller to enable inertial...
Demand response aims at utilizing flexible loads to operate power systems in an economically efficient way. A fundamental question in demand response is how to conduct a baseline estimation to deal with increasing uncertainties in power systems. Unfortunately, traditional baseline estimation lacks the ability to characterize uncertainties due to their deterministic modeling. This deficiency often...
There is a growing interest in utilizing demand-side flexibility to provide ancillary services. Various methods have been proposed for frequency control with thermostatically controlled loads, yet few consider practical load constraints. In this paper, we develop a fully decentralized method to provide primary frequency control (PFC) with domestic refrigerators taking into account startup compressor...
Charging control strategies can significantly alleviate the impact of electric vehicles (EVs) to power systems, as well as utilize the flexibility of EV charging to achieve extra benefits. This paper proposes an EV charging control strategy to achieve valley-filling using EV charging load. The strategy consists of system-level control and supporting control for the charging of individual EVs. The...
This paper presents the Hardware in the Loop (HiL) validation of a control method to regulate the voltage of the DC Bus fed by Distributed Generation (DG) units in an islanded MVDC microgrid. The disturbance based control, employs a decentralized Linear Quadratic Gaussian (LQG) control of individual generator side converters to be executed locally, and which does not need remote measurements of loads...
This paper presents a new modeling framework for analysis of impact and scheduling of price-responsive as well as controllable loads in a three-phase unbalanced distribution system. The price-responsive loads are assumed to be linearly or exponentially dependent on price, i.e., demand reduces as price increases and vice versa. The effect of such uncontrolled price-responsive loads on the distribution...
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...
This paper describes a method for trip-purpose based modeling Plug-in Electric Vehicle (PEV) travel profiles to be used in estimating charging load times and durations. The method uses concepts from Activity-Based Travel Demand modeling to schedule PEV driver activities resulting in driving times and durations, from which the PEV charging profile may be determined (including when the PEV is available...
This paper describes enhancements to ATC's cascading study criteria and the implementation of a fast automated process using POM/OPM software for conducting comprehensive steady state multiple element contingency screening and cascading analysis, finding mitigations to restore the system to be within emergency and/or normal performance limits, and automatically tabulating significant results and summaries...
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