The essence of the method is that , it is basically a nonlinear method and is adaptable to multi - machine hybrid ac / dc power systems 该方法的创新之处在于，它所研究的对象是多馈入直流输电系统，所采用的调制方法是非线性的，且适用于多机电力系统c6
The heart of hvdc link is its control and protect system , and my work is focused on firing - pulse generator an important part in the control and protect system 直流输电的控制和保护二次系统是国产化的重点，而脉冲发生器是控制和保护系统中的关键技术之一。
High voltage direct current ( hvdc ) transmission systems , which are fit for transmission electric power in long distance and large capability , can be widely applied in our country 适合于远距离、大容量输送电力的高压直流输电技术( hvdc )在我国大有用武之地。
This paper discusses the research of ultra hvdc transmission ' s reliability from the system design principle , control levels arrangement and protection areas 为提高特高压直流输电控制保护系统的可靠性，从系统整体设计原则、直流控制分层、直流保护分区等方面提出了具体方案。
The results show that occurrence of the single or double pole block on the dc lines , or short - circuit faults on the dc or ac lines will not influence seriously on power system stability 仿真结果表明：当南桥、华新换流站发生直流输电单双极闭锁以及交、直流侧短路故障时，不会给系统带来稳定问题。
The performance of its basic controller decides the operation condition of hvdc system . for improving the system stability in ac / dc system , the additional controller is very important 直流输电系统能否正常运行与其基本控制器的性能息息相关，附加控制器又是提高交直流互联系统运行稳定性的重要保证。
It ' s high time to introduce decentralized adaptive control techniques into the hvdc control filed . this paper presents a design approach to decentralized robust adaptive controllers for hvdc 随着控制理论和控制技术的发展，分散自适应控制越来越显出它的优越性，将分散自适应控制技术引入高压直流输电控制领域势在必行。
The converters of the hvdc system yield harmonic voltages and currents because of its non - linearity . when the harmonic currents inject the ac and dc systems connected to the converters , they will do harm to the systems 高压直流输电系统中的换流站由于自身的非线性，换流站将产生谐波电压和电流注入它连接的交流系统和直流系统。
From the viewpoint of electrical damping , this dissertation focus on the damping analysis of subsynchronous oscillation for different systems , such as hvdc system , hybrid ac / dc system and multiple - converter hvdc system 目前，直流输电技术已经在我国得到了广泛的应用，并且在今后的几十年中，直流输电在我国还将有更为广阔的应用前景。
After been test , the intelligent slave relized the communication with calss 1st master simadyn d or class 2nd master pc + cp5613 , and was proved to satisfies the requirement of hvdc control and protect system 自主开发的profibus - dp智能从站经测试，实现了与一类主站simadynd或二类主站pc + cp5613的通信，满足了高压直流输电控制保护系统的要求。
