低电压微电网虚拟坐标变换下垂控制策略  

Control strategy of LV microgrid based on virtual frame transformation droop control

作　　者：吴振奎[1] 宋文隽[1] 魏毅立[1] 张继红[1] 赵杰[1] 

机构地区：[1]内蒙古科技大学信息工程学院,内蒙古包头014010

出　　处：《电力系统保护与控制》2014年第8期101-107,共7页Power System Protection and Control

摘　　要：为提高低电压(Low Voltage,LV)微电网处于模式切换过程和孤网模式时负荷功率的稳定性,提出采用虚拟坐标变换下垂控制策略,以解决LV微电网采用传统下垂控制策略导致的分布式电源变流器输出有功功率和无功功率耦合性问题。利用有功功率和无功功率进行虚拟坐标变换与传统下垂控制策略相结合,在LV微电网模式切换过程和孤网模式时,采用传统下垂控制策略对变流器输出功率进行控制,然后对虚拟有功功率和虚拟无功功率进行虚拟坐标逆变换,完成对有功功率和无功功率解耦,进而可以满足负荷功率需求同时优化负荷电能质量。通过仿真,验证此控制策略的正确性和有效性。This paper proposes a virtual frame transformation droop control strategy, to solve active and reactive power coupling of distributed generator converter generated by low voltage microgrid （LV microgrid） with traditional droop control strategy, and the stability of load power is improved when LV microgrid is in mode transition and islanding operation mode. Active power and reactive power virtual frame transformation is combined with traditional droop control strategy. When LV microgrid is in mode transition and islanding operation mode we can control the converter output power with traditional droop control strategy, then use virtual frame inversion transformation for virtual active power and virtual reactive power to realize a completely decoupled relationship between active power and reactive power, thus can both satisfy the demand of load power and optimize load power quality. The simulation proves the correctness and effectiveness of the control strategy.

关 键 词：微电网 低电压 下垂控制 虚拟坐标变换 模式切换 孤网模式 

分 类 号：TM743[电气工程—电力系统及自动化]