摘要
针对并网逆变器采用直接功率逆变时会因电网电压扰动而受到影响的问题,在分析并网逆变器双环控制(电压外环、功率内环)数学模型的基础上,提出了一种功率前馈控制算法。此算法能有效提高传统控制方式输出功率对电网电压发生变化时的响应速度,使系统的动态响应性能更加优越。在EMTDC/PSCAD中进行了仿真分析,并给出了有功率前馈环节和没有功率前馈环节两种情况下逆变器输出功率的对比分析,结果表明该算法能有比较好的控制性能。
Since grid inverter that using direct power control is vulnerable to the disturbance of grid voltage,a control algorithm is proposed,which is deduced according to the mathematic model of the inverter that using double-loop control strategy. The change amount of the output power of inverter is added to the reference of power closed-loop as power feedforward,which improves the dynamic response to the grid voltage change. Simulations with EMTDC/PSCAD are carried out and the comparison of output power response to grid voltage change between control with and without power feedforward verifies its effectiveness.
出处
《电气传动》
北大核心
2013年第S1期28-31,共4页
Electric Drive
关键词
并网逆变器
直接功率控制
功率前馈
动态响应
grid-connected inverter
direct power control
power feedforward
dynamic respons
