带低频纹波抑制的单级充放电高频环节DC-AC变换器  

Single-Stage Charging/Discharging High-Frequency Link DC-AC Converter with Low-Frequency Harmonic Suppression

作　　者：曾汉超 许俊阳 陈道炼[1] Zeng Hanchao;Xu Junyang;Chen Daolian(Fujian Key Laboratory of New Energy Generation and Power Conversion Fuzhou University,Fuzhou 350116 China)

机构地区：[1]福州大学福建省新能源发电与电能变换重点实验室,福州350116

出　　处：《电工技术学报》2018年第8期1783-1792,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金重点项目资助(51537001)

摘　　要：提出一种带低频纹波抑制的单级充放电高频环节DC-AC变换器,并深入分析研究这种变换器的电路拓扑、具有恒流充放电的类整流单极性移相控制策略、稳态原理、输入二倍频电流纹波抑制等关键技术,获得重要结论。该电路拓扑由输入二倍频电流纹波抑制电路和单级充放电高频环节DC-AC变换电路级联构成,该控制策略是通过双向整流电路将高频变压器的正弦脉宽脉位调制波整流成输出正半周或负半周的正弦脉宽调制(SPWM)波,并实现蓄电池的恒流充放电,输入二倍频电流纹波抑制电路是在蓄电池和输入滤波电容之间串联一个L_rC_r并联谐振电路。研制的样机实验结果表明,该变换器具有高频隔离、单级双向充放电、变换效率高、充放电电流纹波小等优点。In this paper,a single-stage charging/discharging high-frequency(HF)link DC-AC converter with low-frequency(LF)harmonic suppression was proposed.In addition,the crucial techniques were investigated and analyzed in detail,such as the circuit topology,analogous-rectifying unipolar phase-shifted control strategy with constant charging/discharging current,steady-state principles and input second harmonic current suppression.The important conclusions were obtained.The circuit topology is composed of an input second harmonic current suppression circuit and a cascaded single-stage charging/discharging HF link DC-AC converter.The control strategy rectifies the sinusoidal pulse width and position modulation(SPWPM)waves of HF transformer to output positive/negative half cycle sinusoidal pulse width modulation(SPWM)waves through the bi-directional rectification circuit,while realizing constant charging/discharging current of the battery.The input second harmonic current suppression circuit is an LrCr parallel-resonant circuit,which is connected in series between the battery and input filter capacitor.Experimental results of the designed prototype show that the proposed converter has the advantages of HF isolation,single-stage bi-directional charge/discharge,high conversion efficiency and small ripple of input current.

关 键 词：蓄电池充放电 单级DC-AC 变换 高频环节 低频纹波抑制 类整流单极性移相控制 

分 类 号：TM46[电气工程—电器]