中文摘要：

谐波屏蔽变压器是一种结合了变压器技术和滤波器技术的多功能变压器。为了分析系统阻抗对谐波屏蔽变压器谐波传递特性的影响，首先给出了两种谐波屏蔽变压器的拓扑结构；在忽略系统阻抗和考虑系统阻抗两种条件下，分别建立了两种谐波屏蔽变压器的谐波数学模型；并引入灵敏度函数的定义，分析了系统阻抗和滤波绕组等值阻抗对网侧谐波电流的灵敏度，分析结果表明：网侧谐波电流对系统阻抗的灵敏度很小，可忽略不计；但它对滤波绕组等值阻抗的灵敏度较大，这为谐波屏蔽变压器的阻抗设计及系统集成设计提供了重要的理论指导；最后，建立了采用两种谐波屏蔽变压器的整流系统仿真模型，仿真结果验证了理论分析的正确性。

英文摘要：

The topologic structures of two harmonic suppression transformers are proposed. To analyze th mecha nism that system impedance affects their harmonic transmission characteristics, the harmonic mathematical models are established in conditions that the system impedance is taken into consideration or not. The definition of sensitivity function is introduced to analyze the sensitivity of windings to the net harmonic current. The theoretical the system impedance and equivalent impedance of filtering results indicate that, the sensitivity of system impedance to the net harmonic current can be ignored; but the sensitivity of equivalent impedance is rather remarkable, which is essentially important to impedance design of transformers and system integrated design. Moreover,the corresponding simulating models of converter system are established, and the simulating results verify the eorreetness of theoretical analysis.