Increasing the regulating ability of a wind turbine in a local power system using magnetic continuous variable transmission

Abstract

The paper is devoted to investigations of dynamic processes in a local power system consisting of wind turbines with a magnetic continuously variable transmission. Due to low inertia of wind turbine generator rotors, there is a problem of ensuring dynamic stability at sharp load changes or at short circuits in an autonomous power system. To increase dynamic stability of the system, two algorithms for controlling a magnetic continuously variable transmission are presented. The first algorithm stabilizes a rotation speed of the high-speed rotor of a magnetic continuously variable transmission from the generator side in a local power system consisting of wind turbines with uniform synchronous generators with permanent magnets having equal moments of inertia. Undoubtedly, local power systems having only the wind turbines with equal mechanical inertia time constants are not widely used due to stochastic nature of wind energy. Therefore, wind power systems are combined with a diesel generator or a gas-turbine unit. Investigations show that the use of the only speed stabilization algorithm is not enough for such power systems, because there is a possibility for occurrence of asynchronous operation under specific power changes due to the difference in moments of inertia of generator rotors. Thus, the second algorithm uses the phase shift compensation in accordance with a primary generator in an autonomous power system consisting of non-uniform generators having different mechanical inertia time constants. As a primary generator, a diesel generator or a gas-turbine unit having a primary speed controller may be used. It should be noted that algorithms of stabilization for speed and phase angle are extended by an inertial circuit of aerodynamic compensation for torque of rotation from the wind turbine side to reduce loading on an energy storage unit of the magnetic continuously variable transmission at disturbances from the generator side and the turbine side.

A Model of Reliability Optimization of a Stand-Alone Electric Power System with Constraints on Dynamic Stability of the Wind Turbine

“…Recently, the interest of researchers has been attracted to controlled magnetic and electromagnetic variators to establish flexible coupling between the turbine and the generator in order to stabilize operation mode parameters [15]. The use of magnetic and electromagnetic variators in the wind power engineering allows to increase reliability and life of generating equipment and to expand the scope of application of wind turbines, including that in the Arctic conditions.…”

“…In particular, there are constraints on the value of installed capacity of the wind farm generating power for shared buses of the electric power system [11]. Additionally, as a countermeasure to the asynchronous run in stand-alone electric power systems, DC inserts [12], energy storage devices [11,13], magnetic gearboxes and variators in wind turbines [14], elements of emergency control automatics [15] are used.…”

Voice Training: Desenvolvimento De Aplicativo Para Treinamento Da Avaliação Perceptiva-Auditiva Da Voz

“…Também observa-se que alterações no plano original da campanha criam vulnerabilidades e o fator humano é determinante para isso, pois Roberts afirmava que Star Citizen custaria até $14 milhões, mas mudou o discurso em busca de "um jogo maior e mais desafiador, um sonho a se realizar", o que após arrecadar quase $240 milhões de dólares, continua sendo apenas um sonho (NEHKARA et al, 2019;ROBERTS, 2015;YIN-POOLE, 2012). Ilhamento 136,137,138,139,140,141,142,144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,160,164,165,168 Instalações elétricas 77,78,79,80,82,83,85,86,242,243,250 L Localização 29,30,32,33,34,36,42,43,45,151,152,153 M 171,175,…”

“…T Tecnologia 2,11,20,27,58,59,60,170,174,175,176,177,178,180,181,182,183,197,221,222,230,231,251,258,274,289 Terminal portuário 29,30,32,33,42 U Universidades 20,22,27,259 V Vernier 170,178,179,180,182,186 Visão computacional 112,113…”

Analysis of the influence of renewable energy sources on thermal energy generation for isolated power systems

“…Energy storages are also used as a damper in various transient processes. Their use is required in wind-diesel systems to ensure electromechanical compatibility of various sources of electrical energy with different dynamic parameters (Adkins et al, 2010; Bhuiyan and Yazdani, 2012; Chong et al, 2016; Udalov et al, 2018; Bashmakov and Dzedzichek, 2017; Bhuiyan and Yazdani, 2012).…”