scholarly journals An LVRT Scheme for Grid Connected DFIG Based WECS Using State Feedback Linearization Control Technique

Electronics ◽  
2019 ◽  
Vol 8 (7) ◽  
pp. 777 ◽  
Author(s):  
Ghulam Kaloi ◽  
Mazhar Baloch ◽  
Mahesh Kumar ◽  
Dur Soomro ◽  
Sohaib Chauhdary ◽  
...  
Keyword(s):  
Wind Energy ◽  
Control Strategy ◽  
Feedback Linearization ◽  
State Feedback ◽  
Low Voltage ◽  
Mechanical Energy ◽  
Control Technique ◽  
Minimal Amount ◽  
Stator Current ◽  
Fault Clearance

This paper primarily focuses on an advance control strategy to enhance the low voltage ride through (LVRT) capability in doubly fed induction generator (DFIG) based wind energy conversion system (WCES). In the proposed control strategy, the captured wind energy during grid faults circumstances is stored timidly in the rotor’s inertia kinetic energy. Though a minimal amount of energy is available in the grid, stator current and DC-link voltage are set beneath the perilous levels. However, both the required stator voltage and stator current are kept within a tolerable range of rotor side converter (RSC), through state feedback linearization technique for maintaining the accurate control to suppress the overvoltage and overcurrent. Furthermore, stator current oscillations are significantly suppressed during fault transient. The input mechanical energy from the wind turbine can be resumed after the fault clearance. In spite of being dissipated in the resistors of crowbar circuit, as in the conventional LVRT assemblies, torque balancing among electrical and mechanical measures is attained; DC-link voltage instabilities and rotor speed inconsistencies are substantially reduced. As a result, a noticeable reduction in the requirement of reactive power and swift restoration of terminal voltage on fault clearance is acquired successfully. Correspondingly, several tests are conducted to validate the effectiveness and enhancement in the performance of the DFIG based wind farms, when the proposed control strategy is implemented over it during numerous fault ride-through circumstances.

scholarly journals Active Power Control of PV-Battery Connected MMC-HVDC System for FRT Support

2020 ◽  
Vol 10 (20) ◽  
pp. 7186
Author(s):  
Md Ismail Hossain ◽  
Mohammad A. Abido
Keyword(s):  
Control Strategy ◽  
Low Voltage ◽  
Power Reduction ◽  
Active Power ◽  
Reduction Technique ◽  
Control Technique ◽  
Transient Performance ◽  
Partial Shading ◽  
Hvdc System ◽  
Conductance Method

Modular multilevel converter (MMC)-based VSC system has become attractive around the world for renewable energy integration. Instead of a dynamic braking resistor, this work proposes an active power reduction technique for PV systems to support the fault ride through (FRT) of the MMC-HVDC system. In addition, it develops a battery control strategy to improve transient performance during solar radiation and temperature change due to partial shading of the PV panels. Besides, a control technique for the battery to regulate the surplus energy in the HVDC transmission network is developed. Furthermore, the proposed control scheme optimally integrates solar energy using the modified incremental conductance method. A feedforward controller was employed to create a standalone AC grid. The complete system has been implemented in real-time digital simulation (RTDS). The results confirm the efficacy of active power reduction technique to protect the HVDC link voltage and battery control strategy for the improvement of transient performance during the irradiance and temperature changes. Besides, it improves the low voltage ride-through capability during balanced and unbalanced disturbances at the point of common coupling.

scholarly journals Model-Based Design of an Improved Electric Drive Controller for High-Precision Applications Based on Feedback Linearization Technique

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2954
Author(s):  
Pierpaolo Dini ◽  
Sergio Saponara
Keyword(s):  
Embedded System ◽  
Control Strategy ◽  
Feedback Linearization ◽  
Position Control ◽  
Design Flow ◽  
Control Technique ◽  
End Effector ◽  
Electrical Drives ◽  
Advanced Control ◽  
Physical Phenomena

This paper presents the design flow of an advanced non-linear control strategy, able to absorb the effects that the main causes of torque oscillations, concerning synchronous electrical drives, cause on the positioning of the end-effector of a manipulator robot. The control technique used requires an exhaustive modelling of the physical phenomena that cause the electromagnetic torque oscillations. In particular, the Cogging and Stribeck effects are taken into account, whose mathematical model is incorporated in the whole system of dynamic equations representing the complex mechatronic system, formed by the mechanics of the robot links and the dynamics of the actuators. Both the modelling procedure of the robot, directly incorporating the dynamics of the actuators and the electrical drive, consisting of the modulation system and inverter, and the systematic procedure necessary to obtain the equations of the components of the control vector are described in detail. Using the Processor-In-the-Loop (PIL) paradigm for a Cortex-A53 based embedded system, the beneficial effect of the proposed advanced control strategy is validated in terms of end-effector position control, in which we compare classic control system with the proposed algorithm, in order to highlight the better performance in precision and in reducing oscillations.

scholarly journals Nonlinear Maximum Power Point Tracking Control of Wind Turbine Based on Two-Mass Model Without Anemometer

2021 ◽  
Vol 9 ◽  
Author(s):  
Jian Chen ◽  
Qun Lu ◽  
Libing Chen ◽  
Xiaohui Duan ◽  
Boping Yang ◽  
...  
Keyword(s):  
Wind Speed ◽  
Nonlinear Control ◽  
Wind Turbine ◽  
Control Strategy ◽  
Feedback Linearization ◽  
Maximum Power ◽  
Control Technique ◽  
Speed Ratio ◽  
Rotor Speed ◽  
Mass Model

A nonlinear control without using anemometer is proposed to achieve the maximum power of the wind turbine (WT) based on two-mass model in this paper. To track the maximum power points, the optimal tip speed ratio control strategy requiring to know the optimal rotor speed of the WT (ORS) is employed. To achieve the ORS, a torque observer is designed to estimate the aerodynamic torque, then the ORS can be obtained by the corresponding calculations based on the estimated torque. Due to the high nonlinearities of the WT and time-varying wind speed, a nonlinear control based on feedback linearization control (FLC) is adopted to track the ORS. In the FLC, the WT is linearized firstly, then the rotor speed controller is designed via linear control technique. The effectiveness of the proposed control strategy is verified by simulation studies. The simulation results show that, compared with the traditional PI control based on torque estimation and FLC based on wind speed estimation, the proposed control strategy provides better dynamic performances and higher power conversion efficiency.

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