摘要
微网孤岛工况下,采用灵活的控制方式提高系统供电可靠性与电能质量,具有深远的研究意义。文中分析了微电源的下垂控制特性,建立了无互联线的多微源并联控制系统。各微源根据P-f和Q-U下垂特性独立控制其输出的有功功率和无功功率,保障微网内的功率平衡;利用小信号法建立了逆变器并联系统的数学模型,设计出下垂控制参数,建立了等容量与异容量双微源并联微网仿真系统,验证了下垂控制方法的可行性及下垂参数选取的合理性。通过单微源实验,对下垂特性进行了实验验证,通过理论分析,计算实时监测反馈数据,与实验波形显示参数进行对比验证,表明了参数设计的正确性和下垂控制策略的有效可行性。
It is of great significance to improve the power supply reliability and power quality of the system under the condition of microgrid islands.The droop control characteristics of the micro-sources are analyzed in this paper. A multi-source parallel control system with no interconnect wire is set up.Varied micro-sources shall be controlled according to the P-f and the Q-U droop characteristic control,targeting at their active power and reactive power and making it possible for equilibrium in power within the microgrid. Small-signal method is used to build the mathematical model which is based on power inverter parallel system.The parameter of droop control is designed. Moreover,two micro- sources interconnecting microgrid simulation system with both the same capacity and varied capacity are established, and the feasibility of the droop control and the rationality of the droop parameter selection are verified. The droop characteristics is verified through single micro-source experiment,the real-time feedback data are calculated through theoretical analysis, compared with the experimental waveform display parameters,the correctness of the parameter design and the feasibility of the droop control strategy are demonstrated.
出处
《高压电器》
CAS
CSCD
北大核心
2017年第11期212-218,共7页
High Voltage Apparatus
关键词
微网孤岛
下垂特性
小信号模型
功率平衡
microgrid islands
droop characteristic
small-signal model
power balance
