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Towards construction of low-carbon electric power systems, installed capacity of renewable energy generations is increasing in recent years. However, it may make the power system operations more difficult due to the uncertainty of the intermittent power generations. Power system stability such as transient stability and voltage stability is one of the issues of concern in the future. A potential countermeasure...
The growing consciousness for increased environment protection has made Electric Vehicles (EV) a more attractive and practical alternative to the internal combustion engine car. The increasing number of EVs connected to power systems for charging will have a significant impact on the operating performance of power systems. This paper proposes a methodology to determine the maximum number of EVs that...
This work presents a model for the enhancement of analysis of overvoltage occurrence in power distribution network caused by lightning discharges. The proposed model combines the ATP-Alternative Transients Program software and results from simulations with the TLM — Transmission Line Modeling method to predict the degree of overvoltage by considering different values of the transient grounding resistance...
Isolated networks are common practice for operating small high voltage networks. The reason for choosing this type of network are the saving of the arc suppressing coils by coexistence of a self-healing grind in case of an earth fault During the starting up of an isolated network several unexpected voltage oscillation phenomena were detected and measured. Investigations have shown that lightning strokes...
This article is a position paper whose purpose is to give the context for presentations in a special session at PowerTech 2013. The special session is being proposed by the EU FP7 Real-Smart Consortium, a Marie Curie Industry-Academic Pathways and Partnerships project. The paper gives an overview of topics on modeling, monitoring and management of power transmission dynamics with participation from...
State estimation has an important role in the operation of power systems and associated power markets. It is well known that state estimators are vulnerable to any existing critical measurements since their errors cannot be detected. Therefore, by manipulating a finite number of critical measurements, a hacker can bias the results of state estimation without being detected. Those biased results include...
Energy costs is a challenge for water distribution networks companies. In the same time, the smart grid provides new opportunities for cost optimization. This paper demonstrates how to use the intrinsic flexibility of water distribution networks (reservoirs and pumping plans), to offer energy modulation services while respecting operational and committed quality of service.
In accordance with 0∼6 hour ultra-short-term forecasting of wind power, a method combine two ways of forecasting is put forward in this paper, in this method, Pattern-matching is used to make a 0∼24 hour forecasting by taking the data of the day before the forecasting day as input, ARMA-model forecasting is used to make a 0∼1 hour forecasting, combine the two results of forecasting to get a 0∼6 hour...
A mathematical model for distribution network reliability calculation is given in this paper. A topological method is used determining such reliability indices as probability of element failure, frequency of element failures, duration of element failure. The method is universal for determination of reliability indices and applicable to calculations of any other (e.g. autonomic) electric power networks.
The novel principle of power maximizing of solar battery (MPPT) is proposed. The proposed system based on use of two low-power sample solar panels with the special controlled current source. These sample solar panels are located in close proximity to the main battery, and thus their electrical characteristics identical to those of the main one. The first sample panel provides information about the...
This paper proposes an alternative method for the coordination of overcurrent protection devices by using an adaptive scheme. This scheme is described as well and validated through two co-simulation techniques: the Real Time simulation (RT) and the Hardware-in-the-Loop simulation (HIL). These techniques require the integration of different software and hardware platforms as PSAT® and LABVIEW®. The...
The impact of the participation of wind farms in frequency regulation in power system damping is studied. Two schemes to participate in frequency regulation are considered, which are based on inertial response and power reserve. Using a 15-bus test system, a small-signal stability analysis is performed for several loading conditions and synchronous generators (SGs) inertia. The impact of WTGs participating...
This paper presents the technical requirements for PEM fuel cell systems to participate as power generation in the Smart Grid. In order to illustrate this, two plants with identical fuel cells are integrated into different system configurations and operated with different management strategies. The aim of this study is to determine the maximum available power of the fuel cell systems for the Smart...
With the increasing use of distributed generation, which is usually connected to distribution or sub-transmission networks, the voltage stability phenomenon can be expected to occur when a system is operating with a high load. It is rarely mentioned in the literature that the problem can be associated with voltage-controlled buses or that voltage control can have the opposite effect to what is expected...
Transient Stability Assessment (TSA) is the process in which the stability of a system is characterized qualitatively or quantitatively. The TSA algorithm presented in this paper is derived from the well-established Single Machine Equivalent (SIME) method and can thus be categorized as a hybrid direct-temporal method. The novelty of the proposed algorithm is that it derives a Transient Stability Index...
The paper considers the possibilities of involving electricity intensive enterprises in the projects for demand side management in a market environment. The example of the copper smelting plant is used to describe the procedure for determining the maximum parameters of electricity demand limitation in terms of technological capabilities caused by the necessity for an enterprise to perform its main...
Renewable energy sources, represented especially by wind energy, has become a representative part of Romanian production. The (N-1) safety principle was verified for the area where the wind power plants have been installed and connected to Romanian Power System. This analysis is focused only to the network adequacy. The purpose is to show that without an appropriate development of the transmission...
The classical distribution system can evolve in a new concept of grid, where the distributed generation is a great factor. These changes take into account the use of power electronic devices. With these devices it is necessary to study the stability of the system in a new form due to their multi-current domain and the influence of the controllers applied to the each device. The paper presents a methodology...
In order to comply with the European Union's ambitious renewable targets for 2020, extensive investments in wind generation capacity have been made. Wind power plants are located primarily where the resource is available, which can lead to local transmission constraints during certain periods. In order to avoid transmission congestions, short-term measures that increase system operation costs such...
This paper presents a methodology for coordinated tuning of power system stabilizers taking into account a set of pre-specified operating conditions. The tuning procedure is formulated as an optimization problem which aims to maximize the system damping ratio. The proposed methodology is based on the bio-inspired Modified Cuckoo Search method. The methodology is applied for coordinated stabilizer...
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