By using several sets of are characteristics and commutating circuit parameters in HVDC circuit breakers, the processes of self-excited oscillation in current commutation have been analysed and simulated.
本文利用几组高压直流断路器开断装置电弧特性和转移回路参数，对自激振荡过程作了较为详细的分析和计算。
And the traditional passive filter`s function is also limited for avoiding the resonance and harmonic enlarging. The auto-compensator and harmonics shielding converter transformer can be used to solve these problems, which is based on the principle of the winding ampere and turn`s balance. This paper elaborates this kind of transformer filter mechanism. In the view of the HVDC system, a new winding connection plan is proposed, and the filter optimization model is created.
作者基于自耦补偿与谐波屏蔽的换流变压器，针对某实际的HVDC模拟系统，提出了与该变压器配套的滤波装置的接线方案，并将外罚函数法和遗传算法相结合，对上述滤波装置进行优化设计，建立了以初期投资最小为优化目标、满足系统无功需求的滤波器优化配置的数学模型。
In most HVDC applications, thyristors are seriesly connected so as to establish required valve voltage withstand capabilities.
而晶闸管的反向恢复特性是阀设计时考虑的重要因素之一。
The reliable HVDC pole blocking universal criteria are studied, initiated and applied in the stability control system.
研究并提出了可靠的直流极闭锁综合判据，并将其应用到稳定控制系统。
The smoothing and filtering network proposed in this paper is integrated smoothing reactor and DC filters on DC side of HVDC system.
提出平波滤波网络，把高压直流输电系统直流侧的平波电抗器和直流滤波器综合起来加以研究。
With the development of technology of electro electric, more and more HVDC systems are build in our country.
随着电力电子技术的发展，高压直流输电系统在我国的应用日趋广泛。
Analysis on influence of ground electrode current in HVDC on AC power network.
直流输电系统接地极电流对交流电网的影响分析。
At the same time, problems of the DC grounding system are valuable because it is not only significant in HVDC operation but also affects the AC system nearby.
同时，直流接地极关系着高压直流输电系统的安全运行，对于附近的交流系统也有影响，其中的一些问题也十分值得研究。
Operation performance of HVDC linear ground electrode system is presented and discussed.
为合理设计直流接地极系统，用数值分析法计算了高压直流输电直线型接地极系统各电气性能参数，讨论了不同模型、电流注入方式等对接地系统电气参数的影响。
Some rules on HVDC protections are obtainedby observing the waveforms which depict the rate of unwanted trip and the rate of failure totrip of the whole protection system changes with those of the protection equipments and themeasurement equipments, respectively.
根据系统误动率分别随测量装置和保护装置的误动率变化的曲线，得出了直流保护系统的一些可靠性规律。
Based on the inverse system method for feedback linearization control of nonlinear system, the inverse system model of VSC-HVDC is derived and corresponding pseudo-linear system is constructed, thus the decoupling of active power and reactive power in VSC-HVDC system is implemented.
基于非线性系统反馈线性化控制的逆系统方法，推导了VSC-HVDC的逆系统模型，构造了伪线性系统，实现了对VSC-HVDC系统有功功率和无功功率的解耦。
Firstly, the steady and dynamic model of HVDC Light and the DQ model of VSC are established.
本文主要研究轻型直流输电系统的控制技术及其应用。
Test HVDC controller by using hybrid real-time simulator.
利用混合实时仿真器测试HVDC控制与保护。
In addition to handling the power exchange, this sophisticated HVDC system can stabilize voltages and frequencies on Sardinia.
除了处理电力转换交流，该复杂的 HVDC 系统还可以稳定撒丁岛的电压和频率。
According to the characteristics of HVDC test line, a corona current measurment system is developed for the investigation of HVDC test line.
针对HVDC试验线路的特点，利用取样电阻法设计了电晕电流测量系统，实现HVDC试验线段电晕电流的地面安全可靠测量。
The characteristics of damping shows that the uncompensated parallel AC transmission line can release the coupling between the HVDC and generator and improve the damping of the system, hence the possibility of subsynchronous oscillation decrease.
4对交直流并列运行系统，采用复转矩系数----测试信号法，对其次同步振荡电气阻尼特性进行了仿真和计算。
Modern thyristor valve s for HVDC are of high power rating and difficult to be tested in a conventional back-to-back test circuit.
现代晶闸管阀的大容量使得难以采用传统的背靠背试验回路对其进行运行试验。
Simulation of HVDC systems is studied and a new principle of firing control and extinction angle control is developed.
文中对直流输电微机控制进行了仿真研究，并提出了触发控制与熄弧角控制的新原理。
A method for selecting the modulation signals of multiple HVDC supplementary controllers is proposed.
提出一种多直流附加控制器调制信号的选取方法。
The thesis introduces the configuration and function of HVDC control system and the essential control mode of the converter station in detail.
三、介绍了HVDC控制系统的结构、各模块的功能，并详细说明直流输电系统换流站上的基本控制方式。