摘要
有源电力滤波器(APF)的高频开关谐波由于通常不包含在电流闭环控制回路内而表现为电压源特性,造成多模块APF模块间的高频谐波环流,增加了系统功率损耗,降低了系统稳定性和控制精度。针对上述问题,对多模块APF并联系统高频谐波环流进行研究,通过构建系统高频谐波环流数学模型,详细分析了环流的形成机理及其影响,并分析了模块输出滤波器(OF)对环流的影响。最后,提出一种多模块APF协调控制方法,以抑制系统高频谐波环流。理论分析和实验结果表明:各模块SPWM载波不同步是高频谐波环流的主要成因;高频环流不流入电网系统;OF能抑制各模块高频谐波电流的非环流分量,而对于环流分量并无明显的抑制效果,相反会降低系统的稳定性;所提模块化APF并联协调控制方案可有效抑制系统的高频谐波环流。
Because the high-frequency switching harmonics of the active power filter( APF) are generally not included in the closed current control loop,they will have the characteristics of voltage source,which may cause the high-frequency harmonic circular currents in the modules of multi-module APF. These harmonic circular currents will increase the power loss and reduce the system stability and control precision. To solve above problems,through building the circular current mathematical model,the formation mechanism of the circular current and its influences are analyzed in detail. Furthermore,the influences of the output filters( OF) on the circular currents are researched. Finally, a coordinated control strategy to suppress the circular currents is introduced. The theoretical analysis and experimental results show that: Firstly,the primary cause of the circular currents is the asynchronization of SPWM carrier waves; Secondly,the circular currents do not flow into the power system; thirdly,the OF can inhibit the non-circular part of the high-frequency harmonic currents,but it is ineffective to the circular part and will undermine the system stability; Finally,the circular currents can be inhibited effectively by the coordinated control method proposed in this paper.
出处
《电工技术学报》
EI
CSCD
北大核心
2016年第5期60-68,共9页
Transactions of China Electrotechnical Society
基金
江苏省高校自然科学研究项目(14KJB470008)
江苏省产学研联合创新资金前瞻性联合研究项目(BY2014127-15)
江苏省"青蓝工程"基金资助
