不隔离单相光伏并网逆变器系统输入电流低频纹波抑制  

Reduction of Low Frequency Input Current Ripple in a Non-Isolated Single Phase Photovoltaic Grid-Connecteds Inverter

作　　者：嵇保健[1,2] 王建华[1] 赵剑锋[1] 

机构地区：[1]东南大学电气工程学院江苏省智能电网技术与装备重点实验室,南京210096 [2]南京工业大学自动化与电气工程学院,南京210009

出　　处：《电工技术学报》2013年第6期139-146,157,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51207023);江苏省高校自然科学基金(12KJB40009);江苏省产学研前瞻性项目(BY2011156);江苏省科技支撑计划(BE2011174)资助项目

摘　　要：单相光伏并网逆变器系统网侧功率时变特性导致前级直直变换器输入电流中含较大(两倍电网频率)低频纹波,影响其对光伏面板最大功率跟踪效果。本文基于反向电流增益Ai(s)(输入电流对输出电流)模型,提出一种新的方法,用于分析单相不隔离光伏并网逆变器系统中前级Boost直直变换器低频纹波特性。本文建立并推导了不同控制方式下的Boost变换器的Ai(s)模型,并在Saber软件中得到验证。指出并验证了平均电流控制方式相比电压控制方式及开环控制方式,在输入电流低频纹波抑制方面更有效,并给出相关的设计准则。仿真及实验表明了该模型的正确性及可行性。Due to power time-varying characteristic of a single phase photovoltaic （PV） grid-connected inverter in grid side, its front-end DC-DC converter tends to draw a large AC ripple current with double grid frequency, which may decrease maxim power point tracking effect of PV side. A novel method is proposed for the low frequency input current ripple analysis of a boost converter in a non-isolated single phase PV inverter, based on back current gain Ai（s） （input current to output current） model. Mathematical models with different control schemes are built and derived, which are verified in Saber environment. It is indicated and proved that average current mode control strategy is more effective than voltage mode control and open loop control methods. Design principles are also presented. Simulation and experimental results are provided for model verification.

关 键 词：光伏 输入电流低频纹波 反向电流增益 平均电流控制 

分 类 号：TM464[电气工程—电器]