This paper presents the modeling, simulation, and analysis of dynamic behavior a fictitious 2 × 320 MW variable-speed pump-turbine power plant, including hydraulic system, electrical equipment, rotating inertias, control systems. The modeling components plant is presented. performances strategy in generating mode one pumping are investigated by simulation complete models case change active set points. Then, pseudocontinuous model converters feeding rotor circuits described. Due to this...

This article has given a significant number of examples contemporary control techniques for EDs. Of course, many more special machines or specific applications can be investigated as well. However, with IMs, PMSMs, SRMs, and hydrogenerators, the most current industrial have been addressed. Most presented are not yet fully used in industry still under evaluation before diffusion at large scale industry. Therefore, techniques, such FTC schemes, investigation reliability requirements. Even if...

Numerical simulations of the transient operation an islanded power network subject to load rejections are performed. The case study consists a 1-GW hydroelectric plant featuring four generating units, long penstock, and surge tank connected 1.3-GW thermal plants passive consumers. modeling every component is described special care paid plant. In particular, high-order used for these investigations enables detailed simulation water hammer, mass oscillations, nonlinear hydraulic...

The dynamic performances of variable speed and fixed units are compared in the case 2 × 320 MW pumped storage power plant. study plant with standard synchronous machine PSS is presented and, then, corresponding system designed for this case. Unsteady numerical simulations both architectures enable to demonstrate that architecture improves stability characteristics local inter-area modes oscillation. Moreover, damping active oscillations originated by part load operation pump-turbine...

A system for wireless power transfer of micro-systems in-vivo implantable in small animals is presented. The described solution uses a servo-controlled transmitter moved under the animal moving space. minimizes irradiation while enabling speeds up to 30 cm/s. An x-y movable magnetic coil transmits required with level able keep constant received energy. permanent magnet on board micro-system and an array sensors form tracking capable alignment accuracy as good 1 cm. transferred over optimized...

This paper presents a numerical simulation study of the transient behavior <TEX>$2{\times}340MW$</TEX> pump-turbine power plant, where results show an unstable at runaway. First, modeling hydraulic components based on equivalent schemes is presented. Then, 2 test case The plant simulated for emergency shutdown with servomotor failure Unit 1. Unstable operation runaway period 15 seconds properly using 1-dimensional approach. points out switch after 200 between oscillations initially to...

Renewable energy sources such as wind and photovoltaic are highly volatile their integration into the grid, goes more through combining them together with complementary flexible sources, a concept known Virtual Power Plant, VPP. Specific control of power plants in VPP pool lead to redefinition dynamic constraints. Interactions between rest grid complex. System level model simulation featuring is necessary must be used for research well design phase. This paper illustrates by time domain...

POWER plants are subject to introduce disturbances in the power grid, resulting from interactions with dynamical behavior of energy source subsystem. In case hydropower when used compensate for variations generation and consumption, instabilities or undesirable may arise. They be caused by phenomena such as part load vortex rope pulsations draft tube Francis turbines. This affect plant lead troublesome grid. paper presents a study an existing that illustrates effects pressure due precession...

This paper presents the start-up and synchronization procedures of a variable-speed pump-turbine unit 250 MW in pumping mode. These applied to doubly-fed induction motor-generator with three-level voltage source inverters VSI cascade rotor side, can be achieved without any supplementary equipment. The control strategy used procedure based on stator flux oriented control, is described details as well different steps order reach minimal speed required for synchronization. controls amplitude,...

Hydroelectric power plants are known for their ability to cover variations of the consumption in electrical networks. In order follow this changing demand, hydraulic machines subject off-design operation. that case, swirling flow leaving runner a Francis turbine may act under given conditions as an excitation source whole system. high load operating conditions, vortex rope behaves internal energy which leads self The aim paper is identify influence full location with respect eigenmodes...

This paper presents the start-up and synchronization procedures of large variable-speed pump-turbine units in pumping mode. These applied to a doubly-fed induction motor-generator with three-level voltage source inverters VSI cascade rotor side, can be achieved without any supplementary equipment, for instance an autotransformer connected rotor. The control strategy used procedure based on stator flux oriented is summarized as well different steps order reach minimal speed required...

This paper presents the modeling, simulation and analysis of dynamic behavior a hydroelectric power plant 2×343 MVA including hydraulic system, electrical installations, rotating inertias control systems. First, modeling systems is described. The system constituted by salient-pole synchronous generator with its ST1A excitation model PSS2B stabilizer model. Then, set parameters turbine speed governor determined specific identification procedure to achieve stable operation for different cases...

This paper describes the design and testing of a new innovative protection relay for protecting large variable speed Double Fed Induction (DFI) machines pumped storage plants. The encompasses with Non-Conventional Instrument Transformers (NCITs), Rogowski CTs resistive voltage dividers, on small DFI machine at EPFL as well RTDS machine, covering range stator rotor fault conditions. For these low frequency currents are supplied to by means VSC (Voltage Source Converter) power electronic...

In electrical systems, the small-signal stability analysis method is usually applied to synchronous machines by using Park representation (d, q-components). This paper presents generalization of a different approach for this method, based on a, b, c phase variables. essential software systems variables as state and its yields tool which fully modular. Two test cases are presented showcase application elements such machines, automatic voltage regulator (AVR), power system stabilizer type IEEE...

This paper presents the modeling, simulation and analysis of dynamic behavior a fictitious 2times320 MW variable speed pump-turbine power plant including hydraulic system, electrical equipments, rotating inertias control systems using software SIMSEN. First, modeling components is presented. Then pseudo continuous approximation introduced. It consists in simplification part plant. Thanks to this simplification, time can be reduced drastically (~ factor 60). The complete simplified models are...

This paper presents the modeling, simulation and analysis of dynamic behavior a mixed islanded power network 780 MVA comprising hydro, thermal wind plants. The modeling each plant is fully described. model variable speed pump-turbine unit includes hydraulic system, electrical equipments, rotating inertias control systems. plants are connected to five passive consumer loads via 500 kV line network. First, capability pumped storage stabilize investigated through time domain entire by...

In large cities, due to expensive land price, high-rise buildings are built, in which the space dedicated elevators is considerable and reduces rented surfaces. To decrease these lost surfaces, a multi mobile system proposed. It consists of several moving cabins same shaft, permitting also horizontal motions. The use direct linear motor drives without counterweight requested. defined by long stator along lift cage PM magnetic way on each cabin. This paper focuses power supply such system. As...

The computation of 3-D magnetic fields is a demanding task in the analysis electrical machines and other electromagnetic devices. In this context, integral field calculation provides smooth solution, high precision resolution, "on-demand"-calculation, an origin-based formulation vector potential. However, conventional elliptic methods lead to huge parallelizable computing efforts significant errors. article, generic current-carrying arc segment with rectangular cross section studied. A new...