其次，通过对发生单重和多重故障时的暂态稳定计算，研究了作为多回直流受端系统的广东电网在发生直流双极闭锁故障时的运行稳定性问题。
Second, by means of the transient stability calculation for single and multiple faults, the stability of Guangdong power grid as a multiinfeed AC/DC power system is studied.
论文首先针对低压输入的条件，提出了一个分阶段双端切换供电的低压Boost系统方案。
To meet the low input voltage condition, a multi-period double-ended supplied low voltage BOOST system control scheme was proposed.
该双端逆变器系统还利用耦合到阻抗源逆变器子系统和逆变器子系统的控制器。
The double ended inverter system also utilizes a controller coupled to the impedance source inverter subsystem and to the inverter subsystem.
针对三相异步电机交流调速系统，重点对由双端PW M变流器组成的异步电机的交流调速系统进行了研究。
For three-phase asynchronous motor AC speed-adjustment system, this paper lays a strong emphasis on study of asynchronous motor AC speed-adjustment system consisted of dual-PWM converters.
针对三相异步电机交流调速系统，重点对由双端PW M变流器组成的异步电机的交流调速系统进行了研究。
For three-phase asynchronous motor AC speed-adjustment system, this paper lays a strong emphasis on study of asynchronous motor AC speed-adjustment system consisted of dual-PWM converters.
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