高压微网运行模式切换控制策略

发布时间：2019-03-22 20:51

【摘要】：以未来可再生电能传输和管理(FREEDM)网络为研究对象,提出一种新型电压模式控制策略,用于实现FREEDM网络联网与孤岛模式间的切换。由于始终将并网逆变器控制为电压源,因此避免了运行模式变化时控制策略的切换,并采用改进的相角下垂控制取代传统频率下垂控制,使微网频率与输出功率分离,降低切换难度。联网运行时,将功率偏差作为反馈量加入到下垂控制环节,实现逆变器的恒功率输出。重新设计同步调节器,使微网进入联网模式时准同期并网,进入孤岛模式时降低脱网过程对微网的冲击,实现平滑过渡。仿真分析表明,本文所提出的控制策略可实现快速同步调节,切换过程公共连接点处(PCC)冲击电流较小,可以很好地稳定微网电压和频率,并有效抑制微网电源间环流。
[Abstract]:Taking the future renewable power transmission and management (FREEDM) network as the research object, a new voltage mode control strategy is proposed, which is used to realize the switching between FREEDM network networking and island mode. Because the grid-connected inverter is always controlled as a voltage source, the switching of control strategy is avoided when the operation mode changes, and the improved phase angle droop control is used to replace the traditional frequency droop control, so that the micro-grid frequency is separated from the output power. Reduce the difficulty of switching. In the networked operation, the power deviation is added to the droop control as a feedback to realize the constant power output of the inverter. The synchronous regulator is redesigned so that the micro-grid will be connected to the grid at the same time when it enters the networking mode, and the impact of the detaching process on the micro-grid will be reduced and the smooth transition can be achieved when entering the island mode. The simulation results show that the control strategy proposed in this paper can realize fast synchronous adjustment, and the impact current of (PCC) at the common junction of switching process is small, the voltage and frequency of microgrid can be stabilized well, and the circulation between microgrid power supplies can be effectively suppressed.
【作者单位】：同济大学电子与信息工程学院;上海环保工程成套有限公司;上海电气集团股份有限公司中央研究院;
【基金】：上海市自然科学基金(13ZR1444400) 上海市科委重大专项(13DZ1200403) 中央高校基本科研业务费专项资金(0800219169)资助项目
【分类号】：TM732

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