【摘要】 研究直流输电系统的谐波特性有助于分析谐波在电气设备、系统中的分布特点和谐波对电气设备的作用程度。介绍了一种基于新型换流变压器的直流输电系统及其采用的感应滤波技术,建立了采用新型换流变压器及其感应滤波系统和采用传统换流变压器及其交流无源滤波系统时表征直流输电系统谐波特性的数学模型,并从理论上对比分析了2种滤波技术对直流输电系统谐波特性的影响,表明感应滤波技术能在阀侧绕组有效实现谐波屏蔽,从而避免传统滤波方式在网侧实施谐波抑制给换流变压器带来的不利影响。通过动模试验验证了理论分析的正确性。更多还原

【Abstract】 An investigation is made on the harmonic distribution characteristics of the HVDC transmission system useful for analyzing the harmonic distribution in electric devices and electric system as well as the effect of harmonics on the electric devices.A new HVDC circuit topology using the new converter transformer and inductive filtering technology is described.The mathematical models for calculating the harmonic characteristics are developed for both the inductive and passive filtering technology and their effects of the HVDC harmonic characteristics are analyzed.It is shown that inductive filtering is capable of suppressing the harmonic at the valve side,thus avoiding the harm of the harmonic on the converter transformer brought about by traditional filtering.The correctness of the analysis is verified by test results.更多还原