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AC-DC Converter with Asymmetrical Higher Harmonics Compensation Function in Sustainable AC Grid

机译：可持续交流电网中具有非对称高次谐波补偿功能的交直流变换器

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In this paper the grid current higher harmonic compensation method for two level AC-DC converters in sustainable AC grid is described. The algorithm is based on Direct Power Control with Space Vector Modulator (DPC-SVM), which was extended by additional Higher Harmonics Compensation (HHC) module. The HHC block is composed of several resonant filters tuned to appropriate frequencies. Both, symmetrical and asymmetrical types of grid currents distortions are analyzed. Operation of the HHC module in stationary αβ coordinates and rotating dq coordinates is discussed. Selected waveforms illustrating operation of the developed algorithm are presented. It is shown that in dq coordinates asymmetrical voltage distortions needs additional effort for its compensation in comparison to symmetrical higher harmonics. The subject is important because in practice asymmetrical higher harmonics usually can appear when one phase nonlinear load is connected to the grid. Even within such conditions the grid connected ACDC converter (GCC) should provide sinusoidal-like current. This assumption provides the reduction of negative impact of the GCC in power quality in Point of Common Coupling (PCC) in sustainable AC grid
机译：本文介绍了可持续交流电网中二级交流交直流变换器的电网电流高次谐波补偿方法。该算法基于带空间矢量调制器的直接功率控制（DPC-SVM），并通过附加的高次谐波补偿（HHC）模块进行了扩展。 HHC模块由几个调谐到适当频率的谐振滤波器组成。分析了对称和非对称类型的电网电流畸变。讨论了HHC模块在固定的αβ坐标和旋转的dq坐标下的操作。给出了说明所开发算法的操作的选定波形。结果表明，与对称高次谐波相比，在dq坐标中，非对称电压畸变需要更多的精力来补偿。该主题很重要，因为在实践中，当一相非线性负载连接到电网时，通常会出现不对称的高次谐波。即使在这种情况下，并网的ACDC转换器（GCC）也应提供类似正弦波的电流。此假设可减少GCC对可持续交流电网中公共耦合点（PCC）的电能质量的负面影响

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