摘要
针对光伏等分布式能源由于发电间歇性和不稳定性导致的虚拟同步发电机直流母线电压不稳定,不能提供稳定和足够的能量缓冲的问题,提出了一种结合双向直流变换器及储能的虚拟同步发电机,研究了双向直流变换器拓扑结构、互补PWM移相调制和母线电压宽范围控制策略。最后进行了基于EMTDC/PSCAD的仿真验证,结果验证了所提拓扑及控制策略的正确性和有效性。结果表明,双向直流变换器及储能单元能够为虚拟同步发电机提供很好的功率和母线电压支撑。
In view of the dc bus voltage instability and the lack of energy buffering caused by the intermittent of photovoltaic and other distributed energy resources, a virtual synchronous generator with bidirectional DC/DC converter and energy storage is presented in this paper. The topological structure, complementary PWM modulation and wide range of bus voltage control are studied. Simulation and experimental results verify the validity and effectiveness of the proposed topology and control strategy by EMTDC/PSCAD. The necessary power and bus voltage support are provided by bidirectional dc converter and energy storage unit for the virtual synchronous machine.
作者
王军章
兰征
WANG Junzhang;LAN Zheng(School of Electrical and Information Engineering,Hunan University of Technology,Zhuzhou Hunan 412007,China)
出处
《浙江电力》
2019年第4期20-27,共8页
Zhejiang Electric Power
基金
湖南省自然科学基金(2018JJ3129)
关键词
虚拟同步发电机
双向直流变换器
交错并联
互补PWM
virtual synchronous machine
bidirectional DC/DC converter
interleaving technique
complementary PWM
