This paper focuses on the power grid oscillation of grid-side converter (GSC) in doubly-fed induction generator (DFIG) caused by sub-synchronous (SSO), and designs a measure to improve output quality GSC. Firstly, influence mechanism multipath disturbance GSC under SSO is sorted out, factors action modes are clarified. Secondly, estimation phase-locked loop (PLL) control strategy calculation pr...

In a wind power generator using doubly fed induction generator (DFIG), the three-phase pulse width modulation (PWM) voltage source converter (VSC) is used as grid side converter (GSC) and rotor side converter (RSC). The standard linear control laws proposed for GSC provides not only instablity against comparatively large-signal disturbances, but also the problem of stability due to uncertainty ...

This paper provides an H∞ robust control strategy for a permanent magnet synchronous generator (PMSG)-based wind farm to realize subsynchronous resonance suppression (SSR) subject uncertain system distortions and parameter perturbation. Firstly, eighth-order state space mathematical model of PMSG-based is established, including the grid-side converter (GSC), GSC controller, phase-locked loop (P...

With the increasing utilization of electronic equipment in power system, sub-synchronous oscillation (SSO) has occurred many times and caused off-grid accidents because oscillation. SSO become one main problems that restrict development new energy. In this paper, grid-side converters (GSCs) doubly-fed induction generators (DFIGs) under is studied. Firstly, influence mechanism on GSC multipath d...

In this work, methods are implemented to improve two aspects of energy quality in a wind generation system. First, the harmonic reduction is achieved by applying linear control technique Grid Side Converter; and second, power factor system using Doubly Fed Induction Generator (DFIG) adjusted injecting reactive power. The content performed with digital resonant controller, which tracks periodic ...

This paper presents Maximum Power Point Tracking (MPPT) controller design of Doubly Fed Induction Generator (DFIG) using Genetic Algorithm (GA). Essential feature of proposed controller is that it is used to trace the maximum power when wind speed is lower than the rated wind speed. Doubly-Fed Induction Generator DFIG has stator terminals are connected directly to the grid. However, the rotor t...

Background: Stress, anxiety, and depression have been reported as very common comorbidities in smokers with chronic obstructive pulmonary disease (COPD). This study was aimed to investigate the effectiveness of smoking cessation on stress, anxiety, and depression in smokers with COPD. Methods: Three block-randomized controlled trial groups with a block size of 6 and 9 including guided self-chan...

Renewable Energy Sources (RES) are nowadays growing rapidly at the distribution level and it employs power electronic converters to ensure reliable operation to the customers. Among the RES, wind energy is now firmly established technology for electricity generation. This paper proposes a conventional PI controller and Artificial Neural Network (ANN) controller to GSC of PMSG, which can obtain ...

The low voltage ride-through (LVRT) capability of the doubly-fed induction generator (DFIG) significantly impacts upon the integration of wind power into the power grid. This paper develops a novel comprehensive control strategy to enhance the LVRT and reactive power support capacities of the DFIG by installing the energy storage system (ESS). The ESS is connected to the DC-link capacitor of th...