摘要
逆变器下垂控制策略的应用对于微电网"即插即用"功能的实现至关重要。针对逆变器传统下垂控制在面对大的负荷增量时存在频率偏差越限问题,结合传统发电机在二次调频操作下频率移动轨迹,设计出新型的S形下垂特性曲线,完成了数学建模,并对S形控制与传统下垂控制的兼容性进行了分析。利用Matlab/Simulink工具进行了仿真,结果表明S形下垂控制能有效缓解下垂控制所固有的频率偏移较大的问题。能够完整保持下垂控制特有的负荷功率自动分配特性,能够较好的与传统下垂控制的逆变器兼容并协调运行。
Application of inverter droop control strategy is vital for micro-grids to maintain the ＂plug and play＂ characteristics. While the conventional droop technology in inverters usually results in large frequency deviations in dealing with large incremental load demand, even breaking the upper and lower frequency limits, the ability of automatic share of load demand among sources is attractive. Based on secondary frequency regulation trajectory of synchronous generators, the S-shaped droop characteristic curve is designed and the mathematical model is built. And then the S-shaped control compatibility with conventional droop control is analyzed. With the help of Matlab/Simulink tools, the simulation results demonstrate that the S-shaped droop control can effectively improve the defect of inherent frequency deviation. The inverter controlled by S-shaped droop can operate with the inverter controlled by conventional droop independently with the ability of automatic sharing load demand among sources. The work is supported by Jiangsu Government Scholarship for Overseas Studies （JS-2012-052）, Fund of Nanjing Institute of Technology （ZKJ201304） and Natural Science Foundation of the Higher Education Institutions of Jiangsu Province （14KJD470004）.
出处
《中国电力》
CSCD
北大核心
2014年第12期88-94,共7页
Electric Power
基金
江苏省政府留学奖学金项目资助(JS-2012-052)
南京工程学院科研基金项目资助(ZKJ201304)
江苏省属高校自然科学基金项目(14KJD470004)~~
关键词
S形曲线
下垂控制
二次调频
微电网
逆变器控制
同步发电机
电能质量
S-Shaped curve
droop control
secondary frequency regulation
microgrids
inverter control
synchronous generator
power quality
