摘要
双模式工作的分布式发电系统存在并网运行与独立运行工作模式切换及电流型控制与电压型控制的控制模式切换。实现运行模式的无缝切换,减小电流电压冲击,是双模式分布式发电技术的关键问题。传统无缝切换控制算法忽略两种切换的不同步性,造成切换过程中出现并网电流冲击大,负载电压波动等问题。本文提出一种电压电流加权控制策略,在不增加系统复杂度的情况下,保证切换过程中的暂态变量均可控,抑制电压电流冲击,实现无缝切换。最后在样机实验中证明了该方法的正确性和可行性。
The dual-mode inverters for distributed generation （DG） systems can operate in grid-connected and stand-alone mode. When the DG transfer the mode between the grid-connected and stand-alone mode, the control mode changes between the voltage control in stand-alone mode and current control in grid-connected mode. The key technology of dual-mode inverter is to achieve the seamless transfer and reduce the impact of current and voltage. During process of the transfer, the traditional seamless transfer control algorithm neglect non-synchronization of two kinds of transition, which address the issue of seamless transition assuming the work mode switching and control mode switching at the same time to complete. If ignoring the situation, it will cause voltage and current overshoot, which is unfavorable to power grid and load. After the transfer transient is detailed analyzed, this paper presents a voltage and current weighted control strategies without increasing system complexity. The strategy can ensure that the switching tr^insient variables can be controlled to reduce the impact of voltage and current, and achieve seamless transfer. Simulations and experiments results verify the availability and correctness of the proposed method.
出处
《电工技术学报》
EI
CSCD
北大核心
2012年第2期217-222,共6页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51077113
50837003)
秦皇岛市科学技术与发展计划(201001A079)资助项目
关键词
双模式
无缝切换
并网
脱网
Dual-mode,seamless transfer, grid-connected, off-grid
