A lot of photovoltaic grid-connected systems have been used in developed countries.
现在，大规模利用太阳能并网发电在许多发达国家已经成为现实。
In the photovoltaic grid-connected systems, the inverter is the core part. the level of its efficiency, reliability will directly affect the whole grid system.
在光伏并网系统中，逆变器是核心的部分，其效率的高低、可靠性的好坏会直接影响整个并网系统的性能。
Large wind farms connected to power grid bring new challenges to optimal operation of power systems.
大型风电场的并网对电力系统的优化运行提出了新的挑战。
Dispersed power generation systems such as photovoltaic, fuel cell, wind power generation need to be connected to a utility power grid for the systems to work effectively.
光伏、燃料电池、风力等分布式发电系统需要并到电网才能更方便被利用。
In photovoltaic grid-connected generation systems, whether the condition of islanding can be detected effectively and timely or not is of great significant for the entire grid-connected system.
在太阳能并网发电系统中，如何有效、及时地检测孤岛效应对整个并网系统具有重要的意义。
A standard grid becomes hard to manage if too many of them are connected to it; supply and demand on electricity-transmission systems must always be in balance.
标准的电网如果接入太多这样的电源则很难管理，输电系统必须随时保持平衡。
Connected photovoltaic arrays and grid photovoltaic grod-connected inverter is the key to the entire grid-connected PV systems.
而连接光伏阵列和电网的光伏并网逆变器便是整个光伏并网发电系统的关键。
Nowadays, the technology of Grid Connected Photovoltaic Systems is one of the research emphases in the applications of the solar energy.
太阳能发电系统并网技术是当前太阳能应用中一个研究重点。
The DC electrical energy generated by photovoltaic systems may also be converted to AC and connected to a utility grid system.
直流光伏系统所产生的电能也可转换为交流电连接到电网系统。
Islanding detection is an essential function of distributed grid-connected power generation systems, as the islanding occurrence is unpredictable and it does great harm.
孤岛检测是分布式并网发电系统的必备功能，因为孤岛的发生一般不可预测且危害极大。
The main contents are as follows:(1) The principles and characteristics of different main circuit topologies of grid-connected photovoltaic systems are analyzed at length.
详细分析了单相光伏并网发电系统的不同主电路拓扑结构的工作特性和工作原理。
Main research subjects are focused on grid-connected control, power flow calculation, modeling and simulation, topology and control and so on, real operation systems are very few.
现有微电网研究集中在并网控制、潮流计算、建模与仿真、拓扑结构与控制等方面，实际投入运营的系统不多。
The solar power system can be adapted to various normal and abnormal grid-connected power systems on the electric network and has high robustness and high fault-tolerance.
该太阳能发电系统可适应电网上各种正常和非正常状况的并网发电，系统的健壮性和容错性强。
The solar power system can be adapted to various normal and abnormal grid-connected power systems on the electric network and has high robustness and high fault-tolerance.
该太阳能发电系统可适应电网上各种正常和非正常状况的并网发电，系统的健壮性和容错性强。
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