A Grid-Connected Control Strategy of NPC Three-Level Inverter for Direct-Driven Type Wind Power Generator

2011 ◽  
Vol 354-355 ◽  
pp. 1338-1341
Author(s):  
Ke Qing Qu ◽  
Yue Hong Xing
Keyword(s):  
Wind Power ◽  
Harmonic Component ◽  
Current Control ◽  
Space Vector Pwm ◽  
Reactive Component ◽  
Power Generator ◽  
Three Phase ◽  
Wind Power Generator ◽  
Grid Connected Inverter ◽  
The Mathematical Model

Based on the mathematical model of the wind power grid-connected inverter, the proposed space vector PWM current control and double current control realize the decoupling for the current active component and reactive component. The simulation results show that the system can output three phase sine current which meet the requirement of the gird-connected, and the harmonic component is low.

scholarly journals Output Control of Three-Axis PMSG Wind Turbine Considering Torsional Vibration Using H Infinity Control

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3474
Author(s):  
Kosuke Takahashi ◽  
Nyam Jargalsaikhan ◽  
Shriram Rangarajan ◽  
Ashraf Mohamed Hemeida ◽  
Hiroshi Takahashi ◽  
...  
Keyword(s):  
Control System ◽  
Wind Turbine ◽  
Wind Power ◽  
Torsional Vibration ◽  
Vibration Suppression ◽  
Current Control ◽  
Metal Fatigue ◽  
Power Generator ◽  
Term Operation ◽  
Wind Power Generator

Due to changes in wind, the torque obtained from the wind turbine always fluctuates. Here, the wind turbine and the rotor of the generator are connected by a shaft that is one elastic body, and each rotating body has different inertia. The difference in inertia between the wind turbine and the generator causes a torsion between the wind generator and the generator; metal fatigue and torsion can damage the shaft. Therefore, it is necessary to consider the axial torsional vibration suppression of a geared wind power generator using a permanent magnet synchronous generator (PMSG). In addition, errors in axis system parameters occur due to long-term operation of the generator, and it is important to estimate for accurate control. In this paper, we propose torque estimation using H ∞ observer and axial torsional vibration suppression control in a three inertia system. The H ∞ controller is introduced into the armature current control system (q-axis current control system) of the wind power generator. Even if parameter errors and high-frequency disturbances are included, the shaft torsional torque is estimated by the H ∞ observer that can perform robust estimation. Moreover, by eliminating the resonance point of the shaft system, vibration suppression of the shaft torsional torque is achieved. The results by the proposed method can suppress axial torsional vibration and show the effect better than the results using Proportional-Integral (PI) control.

A Study of Phase-Locked Technology of Wind Power Generation Three-Phase Grid-Connected Inverter

2011 ◽  
Vol 383-390 ◽  
pp. 3449-3455
Author(s):  
Sheng Wen Fan ◽  
Chun Yu Zheng ◽  
Zheng Xi Li ◽  
Chun Xue Wen
Keyword(s):  
Power Generation ◽  
Wind Power ◽  
Direct Calculation ◽  
Wind Power Generation ◽  
Signal Delay ◽  
Two Phase ◽  
Three Phase ◽  
Voltage Phase ◽  
Grid Connected Inverter ◽  
The Mathematical Model

This paper presents two phase-locked methods of wind power generation three-phase grid-connected inverter. First establishes the mathematical model of the inverter, on this basis analyzes why the power voltage phase must be known. And then studies the direct calculation method in α-β coordinates, and analyzes the shortcomings of this approach for three-phase imbalance; then focusing on the phase locked loop (PLL) approach in d-q coordinate system. To solve dynamic response problem of the PLL, a new signal delay cancellation method is put forward. With this improved method, the PLL can have a better performance. Experimental results show that the theoretical analysis is real.

scholarly journals A Decoupled Hybrid Current Control for Improving the Performance of 60° DPWM-Based Three-Phase Grid-Connected Inverter

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 876-888
Author(s):  
Yuanbin He ◽  
Bangchao Wang ◽  
Xiaogao Xie ◽  
Lei Shen ◽  
Pingliang Zeng
Keyword(s):  
Current Control ◽  
Three Phase ◽  
Grid Connected Inverter
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