基于反馈控制的多逆变电源并联系统

为了实现可靠的多逆变电源并联系统,提出了基于优先级与抢占方式的控制方法,通过硬件逻辑电路、总线技术与无冲突令牌环协议实现了并联冗余技术:提出了一种基于反馈控制的改进型逆变电源并联负载均分控制策略.通过检测并联系统中的瞬时平均电流和各逆变模块中的输出电流,并对这2个电流进行分解,用其分解量进行反馈调节控制输出电压,实现并联系统的均流.仿真实验与实际系统实验证明所提方法能实现多台逆变电源并联系统的稳定可靠运行及负载的均匀分配.同时具有较好的负载适应性,在各种情况下,各逆变电源的输出电流差小于额定电流的2%.

Multi-inverter parallel system based on feedback control

To implement the reliable multi - inverter parallel system,a control scheme based on priority and contention is proposed. The parallel redundancy is implemented with hardware logic circuits,bus technology and in non - conflicting token - ring protocol. An improved load sharing strategy is proposed based on feedback control,which measures the instantaneous average current of parallel system and the output currents of inverters and feeds back the decomposed components of them to control the output voltage for current sharing. Simulative and experimental results prove that,the proposed scheme guarantees the reliable and steady operation of system and the even sharing of load current,with better load adaptability. Under all conditions,the difference of output current between inverters is less than 2 % of rated current.