The correlative items of dc filters are researched on the basis of gezhouba - shanghai hvdc transmission project . in the analysis the three - pulse model is used to simulate converter , which takes into account the impact of the stray capacitance . the harmonics distribution on dc lines is simulated accurately , especially the harmonic ignored in old models 本文以葛上直流输电工程为基础，研究直流滤波器设计中的相关问题，采用考虑了杂散电容的三脉动模型来建立换流站模型，更为准确地模拟出直流输电线路上的谐波分布情况，尤其是模拟出旧模型中忽略的次（为自然数）谐波，为直流滤波器的设计提供了更精确的数据和判断依据。
Based on the detailed investigation about the present conditions of polution in yichang and three gorges dc converter stations and its prediction , and concerning the esdd measurement of dc , ac equipment near the three gorges dc converter station , the operating experience and the atmospheric characters of the yichang city , the porper data of esdd of three gorges dc converter station is presented . and further more , presents the related structural parameters of outer insulation of out door dc , ac equiptment 针对宜昌市大气污染和三峡换流站站址附近污秽状况，结合三峡换流站附近交、直流设备盐密测量和运行经验以及宜昌气候特征，提出了三峡换流站适用的等值附盐密度值，并在此基础上提出了交、直流户外设备外绝缘的有关结构参数。
Utilizing backstepping procedure , general expression of control strategy for hvdc converters is acquired . the control strategy can restrain the nonlinear uncertainty through injection of nonlinear damping terms in virtual controllers . the proposed decentralized adaptive control scheme guarantees that all the signals in the closed - loop system are bounded in the presence of high order interconnections and bounded disturbances 设计中引入自适应非线性阻尼项来抑制系统非线性不确定参数和未知有界干扰的影响，同时采用反演设计方法来克服控制器设计的复杂性，最后获得高压直流输电系统换流站的分散鲁棒自适应控制策略的一般表达式，并提供了整个系统的稳定性证明。
Based on the reference [ 22 ] , the dynamical modeling converters for hvdc system have been transformed to a nonlinear system represented by input - output model with unmodeled dynamics and bounded disturbances , and a robust adaptive output - feedback nonlinear controller is designed . the controller counteracts the uncertain dynamic nonlinearities and bounded disturbances by nonlinear damping terms , and unmodeled dynamics by a dynamic signal 本文在文献[ 22 ]的基础上，对高压直流输电系统换流站动态模型进行变换处理，将其化为一类具有含未建模动态和有界扰动的输入-输出非线性系统，并设计了一种鲁棒自适应输出反馈控制器，利用非线性阻尼项来抑制系统的动态不确定性和有界扰动，引入一动态信号来抑制系统的未建模动态。
According to the practice on gezhouba to shanghai hvdc transmission project and in consideration of condition on three gorges hvdc project , some suggestions on protection of overvoltage and insulation coordination for outer insulation , against pollution - wet , dc neutral bus over - voltage and dc & ac filter are technically presented . it may be a reference in design of three gorges converter station 根据葛南直流工程的经验并结合三峡工程的情况，在换流站的外绝缘、直流耐污湿技术、直流中性母线过电压防护、交直流滤波器的过电压防护等方面提出了过电压和绝缘配合的技术要求，供设计参考。
Lead the team to do the research on the electromagnetic environment of uhvdc transmission line , corona cage test and theory , electromagnetic environment in convert substation , three - dimensional electromagnetic field computation , electromagnetic environment test , electromagnetic environment of dc and ac transmission lines with special configuration , noise in the convert substation and its control measurement 带领团队从事特高压直流输电线路电磁环境研究、电晕笼试验和理论研究、换流站电磁环境研究、三维电磁场计算研究、电磁环境测试研究、特殊结构直流和交流线路电磁环境研究、换流站噪声及其抑制技术研究等。
