为保证分布式接口逆变器能在不改变控制模式的前提下实现并网与孤岛两种工作模式间平滑切换,现在的逆变器控制多采用下垂控制.然而当系统采用下垂控制时,逆变输出电压幅值与频率分别与负载有功功率及无功功率呈现出一定关系,这就使得在负载功率固定的情况下,输出电压幅值和频率固定,增加了系统与大电网同步的难度.针对这一问题,提出了适用于下垂控制的主动同步控制策略,其具有自主、快速和精确的优点,适用于分布式发电单机或多机的双模式运行和多机组网时热插拔功能的实现.%In order to achieve seamless transfer between the mode of islanded and grid-connected without changing the control method,the droop control method is proposed in distributed connected inverter.But when using the droop control method,the output voltage amplitude is related to the reactive power of load,and output voltage frequency is related to the active power of the load.So when the power of load is constant,the output voltage amplitude and frequency is fixed,which make it more difficulty to synchronize the system with large power grid.To solve this problem,an active synchronous control strategy of droop control is proposed which has the advantages of autonomy,fast and accurate,and it is suitable for single or multi-inverter distributed generation with dual-mode operation,and it also supports hot-swap capability.
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