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A centralized reactive power compensation system is proposed for low voltage (LV) distribution networks. It can be connected with any bus which needs reactive power. The current industry practice is to locally install reactive power compensation system to maintain the local bus voltage and power factor. By centralizing capacitor banks together, it can help to maintain bus voltages and power factors...
This work is part of a project that aims to demonstrate the concept of Vehicle-to-Grid (V2G) with an operational fleet. A fleet of electric vehicles is operated with the objective of providing regulation services to the grid. The focus of this paper is on the real-time operation of the fleet. Specifically, given an optimal trajectory for the vehicle state of charge, schemes for distributing the regulation...
This paper presents a new method based on piecewise analytical formulas to evaluate the valve losses of the modular multilevel converter based high-voltage direct current (MMC-HVDC) transmission systems. According to the generating mechanism, the total valve losses of the MMC are divided into three parts: conduction losses, essential switching losses, and additional switching losses. Due to the large...
The problem of integrated expansion planning is the problem of finding the optimum generation mix to meet the future energy demand with least cost. Different energy systems are traditionally assumed independent and planning is carried out separately. However, recently more attention is paid into the interdependencies of energy systems such as electricity and natural gas. In this paper, the demand...
This paper describes hands-on solid modeling experience of the safe optimal ground grid design (less copper) for a large Extra High Voltage (EHV) substation. The optimized ground grid meets the IEEE-80 standards for safety without compromising on step or touch potential thresholds. The ground grid has been designed in CDEGS using fault current flow concepts, and multiple injection points simulate...
In market operations, Distributed Generators (DGs) and price-sensitive loads participate in a microgrid energy market implemented in JADE. Each DG and each price-sensitive load is represented by the respective agents which perform various functions such as scheduling, coordination and market clearing subject to system, DG and load constraints. Each agent is assigned to one of the several agent objectives...
Recently, there has been a growing need to consider issues related to multiple uses of water—such as navigation, fishing, or recreation—in the operation planning of electrical power systems, specially in predominantly hydro systems. In short-term models, it is of particular importance to consider maximum/minimum values and ramp limits for the stream level of a river. However, in order to properly...
In this paper a typical 400 kV CVT is simulated for Ferroresonance and Transient Response conditions using Active and Passive Ferroresonance Suppression Circuits (FSCs) available in the literature. The effect of the FSC and other parameters on the transient response is analyzed. A novel thyristor based Electronic FSC is proposed in this paper which is suitable to suppress both the Ferroresonance and...
Mechanical failure is the main fault of transformer on-load tap-changers (OLTC), and part electrical failure, to a certain degree, is originally caused by mechanical malfunctions. In order to detect the hidden mechanical faults of OLTC timely and effectively, this paper presents the fuzzy C-Means (FCM) algorithm to recognize the distribution patterns of reconstructed vibration signals, which are closely...
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...
Uncertainty in power output of photovoltaic (PV) plants has raised concerns in regard to the interconnection of PV plants to the power systems. Climate conditions vastly affect the uncertainty of output power; however, aggregation of PV plants is potentially able to reduce the uncertainty; hence, the effectiveness of aggregation should be evaluated for climatically diverse locations. In this paper,...
The variability of large scale wind power generation at high penetration levels has a significant impact on the secure and economic operation of onshore power systems. Grid bottlenecks, high gradients and wasting of wind energy can be avoided using local Energy Storage Systems (ESS) with dedicated power and capacity. The storage type considered in this study is an adiabatic compressed air energy storage...
Solving economic dispatch problem (EDP) in a distributed way has attracted lots of attention in recent years due to its scalability and robustness to single points of failure. Robust distributed system Incremental Cost Estimation (RICE) algorithm has been proposed to solve the classic EDP in a distributed way considering communications information losses. However, assuring the stability of the algorithm...
Conventional centralized dispatch has inherent drawbacks to handle the increasing penetration of distributed generation in distribution systems. This paper discusses a decentralized synergetic dispatch paradigm for prosumer-based interconnected microgrids, in which a prosumer is defined as an autonomous agent that can produce, consume, and store electricity. We consider a double-sided market mechanism...
In this paper we propose to schedule both real power and voltage settings of generators participating in electricity markets. This can be done by utilizing an extended AC Optimal Power Flow (AC X-OPF). This will provide a one-step method performed by the Independent System Operator (ISO) in charge of electricity market clearing; iterative decisions by the ISO and the system operator ultimately responsible...
As the penetration of wind generation increases, the effects of ramping events on power system security become serious. In order to improve the output characteristics of wind generation, wind farms coordination control based on contribution index is proposed to ensure wind farms to respond to scheduling plan of virtual power plant (VPP). Based on the power regulation amount of wind farms, regulation...
Overhead (OH) transmission lines when loaded always consume reactive power. An underground (UG) power cable on the other hand is in itself a huge capacitor and therefore a source of reactive power. This paper highlights the use of UG power cables in conjunction with overhead lines, where the reactive power requirement of overhead line is compensated by UG power cables. To realize this compensation,...
With the increasing utilization of combined heat and power plants (CHP), electrical, gas, and thermal systems are becoming tightly integrated in the urban energy system (UES). However, the three systems are usually planned and operated separately, ignoring their interactions and coordination. To address this issue, the coupling point of different systems in the UES is described by the energy hub model...
This paper presents a reclosing scheme for parallel lines on the same tower. The present reclosing scheme for parallel lines in China will result in opening both lines when any type of inter-circuit permanent fault occurs. In contrast, the proposed reclosing scheme is able to avoid opening both lines and keep a quasi-three-phase operation as far as possible for inter-circuit permanent faults, thus...
The planning of distribution network is faced with a great challenge when large-scale renewable energy mostly wind power entering into power system. This paper proposes a bi-level programming model considering distributed wind generation (DWG) allocation in the active distribution network environment which introduces active management fee (AMF) concept firstly. The bi-level programming is a complex...
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