The 3 , 000 megawatt ( mw ) power link went into commercial operation on dec . 9 during an inauguration ceremony at the huaxin hvdc receiver station on the outskirts of shanghai , china ' s largest city 该3 , 000兆瓦电力线在12月9日开始投入商业运营，这天在上海这个中国最大城市的市郊的华新hvdc换流站举办了投产庆祝典礼。
A commutator - brush combination is used as a mechanical rectifier to make the armature terminal voltage unidirectional and also to make the mmf wave due to the armature current fixed in space 通过使用换流器电刷的组合作为一个机械整流器以使得电枢的端电压为单方向的同时也使得由电枢电流所产生的磁动势在空间是固定的。
Combinations of igbts controlled by four - step current commutation algorithm , was implemented by the cpld , which was also forecasted and validated by the simulation and experiment 为进行对矩阵式变换器系统的实验研究，采用cpld (复杂可编程逻辑器件)实现了igbt组合双向开关的四步换流逻辑控制，并通过仿真和实验进行了预测和验证。
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。
The simulation results show that , with the proposed coordinated recovery strategy implemented , the recovery performance of the tested multi - infeed hvdc system has been improved a lot when compared with the conventional control strategy " 该方法更注重直流系统两端控制间的协调，更注重在直流系统恢复期间对其换流母线电压的维持。
Using the voltage stability graph , the voltage stability margin can be known . the bus participation factors can be computed from the left and right eigenvectors associated with the minimum eigenvalues 在求最小特征值的同时，求出该最小特征值对应的左、右特征向量，利用左、右特征向量来计算在最小特征值为零时的换流母线参与因子。
