电网

The result shows that new method can control the input current well sinusoidal, decreases harmonics components, keeps the DC voltage flatted, and provides fairly good fault ride-through capability for the PWM rectifier

结果表明，新的控制方法能使PWM整流器在故障电网下的输入电流正弦，抑制了谐波功率的产生，保证了直流电压的稳定，增强了PWM整流器故障不间断运行的能力。

With the development of society and sharp increase of electricity consumption, the electric power networks become much huger and more complex.

随着社会的发展和用户对用电质量的提高，传统的机械式有载调压方法已经不能完全满足现代电网的安全和经济运行要求。

Along with the development of industry, the electronics and electric devices are used widely day after day, and the harmonic wave pollution in the electric network becomes worse and worse, therefore imperils the safe and economic running of electric system.

随着工业的发展，电力电子装置应用的日益广泛，电网中的谐波污染日趋严重，这严重威胁着电力系统的安全经济运行。

To ensure secure and stable operation of islanded power network, it is urgently necessary to know about its power flow distribution.

电力系统实际运行中，某些原因会导致局部电网解列，形成孤网运行的情况，为保证孤网的安全稳定运行，需要知道孤网的潮流分布。

The dynamical characteristics of a low voltage MicroGrid from grid-connected mode to islanded mode with different distributed generation configuration schemes are analyzed by using simulation method,and the corresponding changing laws of each DG's power,voltage and frequency of MicroGrid are obtained.

通过算例仿真研究了不同分布式电源配置方案下低压微网从并网模式向孤网模式转换的动态运行特性，获得了分布式电源的功率、微网电压和频率的变化规律。如果选择微型燃气轮机作为微网的功率支撑手段，在微网从并网向孤网过渡过程中，系统频率波动较大，且部分分布式电源有可能在低频保护动作下与电网隔离，不利于微网的稳定运行；增加储能设备后，储能设备对于微网的稳定运行可发挥重要的作用。

Microgrids are small low or medium voltage electrical network of small modular distributed generators. A microgrid system can operate in grid-connected or islanded mode, and hence increase the reliability of energy supplies.

微网是一种可将各种分布式电源组合起来为当地负荷提供电能的中、低压小型电网，具有并网和孤岛两种运行模式，能提高负荷侧的供电可靠性。

Islanding algorithm of distribution networks with distributed generators.

分布式发电条件下的配电网孤岛划分算法。

Note: Islanding is either a deliberate emergency measure, or the result of automatic protection or control of action, or the result of human error.

注：电网解列既可能是一种慎重的紧急措施，或是自动保护或调节作用的结果，或是人为错误造成的。

The simulation results shows that this method can rapidly detect the occurrence of islanding and disconnect the inverter with the grid, no non-detection zone, the islanding can effectually be prevented.

仿真结果表明该方法能够快速地检测出孤岛的发生并断开逆变器与电网的连接，无检测盲区，对孤岛效应能够做到有效的防范。

The sum will cover expenses such as collecting and analyzing hydrological, geological and meteorological data as well as linking a production unit up to the electricity network and mechanizing it.

这笔资金还将包括其它方面的支出：如收集并分析水文、地理、气象数据，连接电网以及机械动力的支出。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。