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中文摘要：
利用开关函数对换流器的调制作用进行了理论推导,从电路原理的角度对谐波通过直流换流器在交流侧和直流侧来回传递的全过程进行整体考虑,提出一种判断系统是否发生谐波不稳定的新判据。以糯扎渡—广东特高压直流输电系统为例,建立了电磁暂态模型,基于新判据进行频率扫描分析,并进行了故障仿真验证。研究结果表明,该判据能够很好地评估高压直流输电系统送端发生谐波不稳定的风险。
英文摘要：
The modulation of the DC converter theoretically based on switching function is deduced.By considering the whole process of harmonic transfer back and forth through DC converters in the AC side and DC side as a whole,a new criterion to determine whether the harmonic instability occurs is put forth from the perspective of the circuit.The ultra high voltage direct current（UHVDC） power transmission project from Nuozhadu to Guangdong is used as an example,an electromagnetic transient model is established.Then the frequency scanning analysis based on the proposed criterion and fault simulation verifications have been carried out.The study results indicate that the proposed criterion can assess the risk of harmonic instability at sending end of HVDC power transmission system.
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