基于直流电网的非并网风电系统及其控制策略  

DC Grid Based Non-grid-connected Wind Power System and Its Control Strategy

作　　者：陈杰[1] 张先进[1] 龚春英[1] 严仰光[1] 

机构地区：[1]南京航空航天大学自动化学院,江苏省南京市210016

出　　处：《电力系统自动化》2009年第10期86-90,共5页Automation of Electric Power Systems

基　　金：国家重点基础研究发展计划(973计划)资助项目(2007CB210303)~~

摘　　要：大规模非并网风力发电理论避开了风电并网的技术难题。文中针对大规模非并网风电系统,采用一种基于直流电网的系统结构,具有能量转换过程少、结构简单、损耗低和可靠性高等优点。针对文中所述的直流电网,提出了电压分级控制策略,该控制策略不仅可以保证低风速时用电负载的正常运行要求,而且大大降低了风电系统与电网的功率交换,减小了风电对电网的影响。用Saber软件建立了仿真模型,仿真结果验证了文中提出的基于直流电网的非并网风电系统及其功率控制策略的可行性。Lager-scale non-grid-connection wind power theory avoids the technical issue of integrating wind power into utility. This paper introduces a novel system structure based on the DC grid for the large scale non-grid-connection wind power application. The system is especially suitable for the wind power generation system where full power conversion and high energy consumptive DC load is used. The proposed system has the merits of less power conversion train, simple structure, low power losses and high reliability. Then, a bus voltage step control strategy is proposed for the DC micro-grid system. By using the control strategy, not only the normal operation requirement of terminal devices is guaranteed, but also the power exchange between wind power system and utility is minimized. Finally, a system model is established with Saber simulator, and the simulation results verify the feasibility of the proposed system and its power control strategy.

关 键 词：非并网风力发电 直流电网 直流变压器 控制策略 

分 类 号：TM614[电气工程—电力系统及自动化] TM76