新型H桥级联型风机并网检测装置研制

Development of a New Type of H-bridge Cascaded Wind Turbines Interconnected to Power Grid Test Equipment

在调研风电机组并网检测相关需求的基础上,提出一种能够兼顾低电压穿越(LVRT)和电能质量指标扰动穿越能力检测的实验设备。该装置采用H桥级联型多电平变流器结构,配合载波移相脉宽调制(CPS-PWM)策略和直接矢量控制模式,实现了电压跌落、谐波、电压波动、不平衡等多种扰动电压输出,从而为风电机组并网测试创造条件。在Matlab/Simulink仿真分析的基础上,研制了可移动式35kV/4MVA风电机组并网检测装置,仿真分析和实际装置的现场实验结果验证了装置主电路和控制策略的正确性。除了风电机组并网检测外,该装置还可应用于光伏电站并网检测、静止无功发生器(SVG)出厂性能检测,应用前景广阔,极具推广价值。

On the basis of investigating the related requirements of grid connection detection for wind turbines,a test equipment that can consider both low voltage ride through(LVRT)and power quality index disturbance ride capability detection is proposed.The device adopts the structure of H-bridge cascaded multilevel converter with carrier phase shift pulse width modulation (CPS-PWM)modulation strategy and direct vector control mode,voltage sag,voltage fluctuation,harmonic and unbalanced voltage output to achieve a variety of disturbance,so as to create conditions for wind generator test.On the basis of Matlab/Simulink simulation and analysis,a mobile 35 kV/4 MVA wind turbine connected detection device is developed.Simulation analysis and field test results of the actual device verify the corr- ectness of the main circuit and control strategy of the device.In addition to wind power grid connection detection,the device can also be applied to photovoltaie power station grid connection detection and static var generator(SVG)factory performance detection.It has broad application prospects and has great popularization value.