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    • 3. 发明申请
    • VALVE CURRENT CONTROL METHOD BASED ON MODULAR MULTI-LEVEL CONVERTER
    • 基于模块化多电平转换器的阀门电流控制方法
    • US20140003101A1
    • 2014-01-02
    • US14005265
    • 2011-10-31
    • Guangfu TangJie YangShanshan WangMing KongDong Liu
    • Guangfu TangJie YangShanshan WangMing KongDong Liu
    • H02M7/44
    • H02M7/44H02M1/14H02M7/483H02M2001/0003H02M2007/4835
    • The present invention relates to valve current control method based on modular multi-level converter, this method includes the control of the low frequency oscillations of the current and that of double frequency harmonic component; For said low frequency oscillations of the current, the control method includes some steps as below: first, calculate the half of the sum of the upper arm current and the lower arm current, it is the valve DC current component, said DC current component is arm circulating current; Secondly, comparing the actual value of the arm circulating current to setting value of that, the error is obtained, after some signal processing, additional output set voltage is obtained. For said the double frequency harmonic component of current, the control method includes some steps as below: firstly, figure out capacitor voltage fluctuation prediction value of the sub module; secondly, the output voltage is divided by the sum of the sub module reference voltage and the capacitor voltage fluctuation prediction value, and get the actual output set number of sub module. This method not only can realize stability of the dynamic performance of the system, but also can suppress the arm double frequency harmonic component, at the same time under the abnormal conditions of the AC system; the valve current has good output characteristics.
    • 本发明涉及基于模块化多电平转换器的阀电流控制方法,该方法包括对电流的低频振荡和双频谐波分量的控制; 对于电流的所述低频振荡,控制方法包括以下步骤:首先计算上臂电流和下臂电流之和的一半,即直流电流分量,直流电流分量为 臂循环电流; 其次,将臂循环电流的实际值与其设定值进行比较,在获得了一些信号处理后,获得了附加的输出设定电压的误差。 对于电流的双频谐波分量,控制方法包括以下几个步骤:首先求出子模块的电容电压波动预测值; 其次,将输出电压除以子模块参考电压和电容器电压波动预测值的总和,得到子模块的实际输出设定数。 该方法不仅可以实现系统动态性能的稳定,而且可以在交流系统的异常情况下同时抑制臂双频谐波分量; 阀门电流具有良好的输出特性。