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This work is concentrated on transfer of power quality disturbances in active distribution network containing small hydro power plants (SHP). Investigations are based on the dispersed synchronized measurements using power quality recorder installed in the two substations connected to the same medium voltage line. Dynamic aspect of SHP work represented by switching on capacitor banks are tracked in...
Power quality is the set of regulations of electrical properties that allows electrical systems to function without significant loss of performance or aging. The term is used to describe electric power that drives an electrical load and the load's ability to operate properly with that electric power. Without the proper power, an electrical device (or load) may malfunction, fail prematurely or not...
The following topics are dealt with: solar energy power generation; power system control; advanced distribution system operation; large scale renewable energy power generation; VSC-HVDC; distributed generation; SCADA; energy management system; energy storage; FACTS; microgrid; power market; load forecast; power system planning; power quality; black-out prevention; smart grid; system simulation; substation;...
Within the paper, the authors deal with electric substation ancillary services power consumption analysis. They are focusing on load curve numerical processing. A real case study is discussed, Timisoara 400/220/110 kV substation, the consumers being supplied from the autotransformer tertiary winding. The parameters specific to ancillary services load curves are computed using a software tool developed...
Ancillary services are support services within the power system, those which are necessary to support the transmission capacity and are essential in maintaining power quality, reliability and security of the grid. Considering these facts the supply method of the ancillary services is a key feature for the appropriate operation of the power system. Within this paper the authors are focusing on electric...
This paper presents a useful and practical approach for assessing the impact of electric vehicles on the electric power distribution system while keeping to a manageable volume of detailed circuit and equipment studies. This paper addresses electric vehicles as an electric load only and does not consider the potential of the vehicle being a generation source. It also only addresses the substation,...
An increasing amount of distributed generation in the future grid will be connected at the customer's point of connection. The generation within the low voltage grid will affect the power quality of customers connected to this grid. Hence, the concept of a Smart MV/LV transformer as a part of the Smart MV/LV substation is discussed in this paper. The main aims are to support the accommodation of distributed...
As technology and economic development, the requirements of community power quality, continuity and reliability are increasing. Contradiction between supply and demand will become more and more prominent. Power distribution system is an important part of the user connection. It is directly related electrical safety and reliability to the user. At present 10 kV Substation is and implementation of power...
It is necessary to monitor and analyze the power quality firstly in order to solve the power quality problems in power system, and then the possible reforming project can be put forward for improving power supply quality. According to the actual situation in the region, a system approach to voltage sag monitoring and analyzing has been designed and developed. The system and its composition, software...
The assurance of the power quality supplied to consumers represents one of the most important issues that have to be fulfilled, related to substation ancillary services power supply sources. The aspects concerning the power quality are highlighted for the designed and planning of the substations belonging to the transmission network. Within the monitoring process several quantities are analyzed. The...
In power system reconfiguration after successful black start, the maximum restorable load that substation can pick up at one time should be given. Presently, researches about the problem usually concentrate on frequency constraint and steady-state voltage constraint. In this paper, a method that can give the maximum restorable load is proposed which considers transient voltage-dip acceptability (TVDA)...
In this paper, comprehensive testing of the power quality in a typical utility grid in existence of the electric railway traction load is taken, the measurement and simulation results are analyzed, it is verified that the electrified railway grid is an important factor in pollution of typical utility grid. Firstly in this paper, the typical utility power grid and traction power supply system model...
In Finland during summer time, lightning may cause a considerably high number of short interruptions and voltage sags. In case of lightning, the overvoltage protection of power distribution transformers has an important role. In case of special concern of voltage sags, the means to limit the short circuit faults causing voltage sags should be focused to the neighbourhood of the primary (110/20 kV)...
The Colombian Energy and Gas Regulating Commission -CREG- through resolution CREG 024 of 2005, requires monitoring some power quality disturbances in substations of distribution systems; the main objective of this resolution is determine electrical power quality supplied by the utility operators to costumers by means of measurements analysis. In this paper the authors proposes a computational tool...
The following topics are dealt with: transmission and distribution system planning; wind generation; reliability; emergency response; disaster; FACTS; HVDC; power quality; protective relaying; transformer; circuit breakers; cables; insulators; switchgear; fuses; tower; poles; conductors; electric machines; drives; and substation.
Necessity for power quality monitoring emerges from rules on deregulated market, legislation according to it, standardization and quality control of delivered merchandise (electrical energy) to the customer, as well as a control mechanism for customers' installations effect on public distribution networks. On today's market of power quality measuring devices there is a lot of quality hardware, but...
Transelectrica is the Romanian Transmission and System Operator (TSO). In the company's activities, the Power Quality aspects are very actual and important. First part of the paper contains the standards and technical requirements regarding the Power Quality aspects included in Romanian technical code of the Electricity Transmission Grid. The reference concerns only the high voltage grid. The second...
The following topics are dealt with: fuzzy-based maximum power point tracker; solar panels; wind power planning; cogeneration; power quality; power systems protection; ungrounded distribution systems; fault detection; power transformers; support vector machines; load forecasting; pumped storage units; zero-current-switching pulse-width-modulated converter; battery chargers; shock hazard; lightning...
Poor overcurrent protective device coordination can cause prolonged and unnecessary voltage variation problems. The coordination of many protective devices can be a difficult task and unfortunately, device performance and accuracy are not evaluated once the device settings are chosen and deployed. Ideally, an automated system would interrogate system data at the substation and estimate voltage variations...
In power utilities, grid operators monitor power-quality phenomena such as voltage sag at several substations to obtain an overview of the general network state and evolution of power quality. Collections of these huge online data from disturbance recorders involved long and tedious downloading process, usage of Internet protocols consumed bandwidth and causes traffic congestion and collisions with...
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