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微网是解决大规模分布式发电并网的有效方法,微网中逆变器的功率均分及微网系统的建模及稳定性分析是目前的研究热点。要实现微网逆变器功率均分控制和建立微网系统精确模型,微网中馈线阻抗是不可缺少的重要参数,现有多种线路阻抗实时测量方法基本是基于分布式发电或者大电力系统应用考虑,在微电网中应用受到限制。分析了现有的阻抗测量方法的优缺点,针对现有线路阻抗测量技术存在的不足和应用场合限制,提出一种基于MGCC协调控制的,适用于微网中应用的线路阻抗测量方法。文章针对所提的测量方法进行了理论分析和仿真验证,证明了所提方案的可行性。 相似文献
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In order to integrate a proton exchange membrane type (PEM) fuel cell system (FCS) combined with a battery bank to a distribution grid; this paper proposes a local controller based on fuzzy logic. The proposed system provides primary frequency control and local bus voltage support to the local grid. This opposes the passive distributed generation of the present that do not provide auxiliary services, such as back-up power, voltage support and reliability of supply as they operate under constant power factor equal to 1 at all times. During network disturbances, the distributed generations of the present are disconnected until normal operation is reestablished. When the distributed generation penetration is high this may lead to system instability. The microgrid concept is the effective solution for the control and quality improvement of grids with high level of DG penetration. So, the proposed system, also, can be an active controllable microsource of a microgrid in the future that cooperates with other microsources in order to cover the local load demands for active and reactive power either under grid-connected mode or under islanding operating mode. In cases where the distribution grid (working as microgrid) is forced to operate in islanded mode, the hybrid system provides the demanded active and reactive power. The FCS is connected to a weak distribution grid so that the system performance is studied under the worst conditions. The simulation results are obtained using MATLAB software under a severe step load change where the grid is still connected and under islanded operation. In both cases the system presents a good performance. 相似文献
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