The growing installed wind capacity over the last decade has led many energy regulators to define specific grid codes for wind energy generation systems connecting to the electricity grid. These requirements impose strict laws regarding the Low Voltage Ride Though (LVRT) and High Voltage Ride Though (HVRT) capabilities of wind turbines during voltage disturbances. The main aim of this paper is to propose LVRT and HVRT strategies that allow wind systems to remain connected during severe grid voltage disturbances. Power quality issues associated with harmonics and inter-harmonics are also discussed and a control scheme for the grid-side converter is proposed to make the Wind Energy Conversion System insensitive to external disturbances and parametric variations. The Selective Harmonic Elimination Pulse Width Modulation technique based on Genetic Algorithm optimization is employed to overcome over-modulation problems, reduce the amplitudes of harmonics, and thus reduce the Total Harmonic Distortion in the current and voltage waveforms. Furthermore, to compensate for the fluctuations of the wind speed due to turbulence at the blades of the turbine, a fuzzy Proportional-Integral-Derivative controller with adaptive gains is proposed to control the converter on the generator side.

中文翻译：

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使用遗传算法优化的PWM和模糊自适应PID控制，通过并网风能系统缓解带有LVRT和HVRT增强的谐波和间谐波

在过去十年中，风能装机容量的不断增长，导致许多能源监管机构为连接到电网的风能发电系统定义了特定的电网规范。这些要求对电压扰动期间风力涡轮机的低压穿越能力（LVRT）和高压穿越能力（HVRT）施加了严格的法律。本文的主要目的是提出LVRT和HVRT策略，以使风力系统在严重的电网电压扰动期间保持连接。还讨论了与谐波和间谐波有关的电能质量问题，并提出了一种用于电网侧变流器的控制方案，以使风能转换系统对外部干扰和参数变化不敏感。采用基于遗传算法优化的选择性谐波消除脉冲宽度调制技术来克服过调制问题，降低谐波幅度，从而降低电流和电压波形中的总谐波失真。此外，为了补偿由于涡轮叶片的湍流引起的风速波动，提出了具有自适应增益的模糊比例-积分-微分控制器来控制发电机侧的变流器。