| 引用本文: | 杨 亮,苏 剑,刘海涛,吕志鹏,王逸超,贺加贝,王 聪.单相并网逆变器的直流分量抑制策略[J].电力自动化设备,2015,35(4): |
| YANG Liang,SU Jian,LIU Haitao,LÜ Zhipeng,WANG Yichao,HE Jiabei,WANG Cong.DC component suppression strategy for single-phase grid-connected inverter[J].Electric Power Automation Equipment,2015,35(4): |
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| 摘要: |
| 为解决并网逆变器的直流注入问题，以LCL型并网逆变器为研究对象，提出一种可抑制直流分量的并网逆变器电流跟踪控制策略。所提策略采用直接控制入网电流的双闭环技术，其中电流外环在常规基波电流控制支路的基础上，增加了一条由积分控制器组成的直流分量抑制支路，在不影响逆变器基波电流跟踪控制表现的基础下，可增大逆变器的直流输出阻抗，抑制直流分量的产生。所提策略实现简单，无需检测输出电流中的直流分量，其直流抑制的机理为在逆变器输出端口串联一个在直流分量无穷大而在交流频率处的阻值有限的虚拟阻抗。通过建模和频域分析证实了所提策略的直流抑制性能。仿真和实验进一步验证所提策略不仅可以实现基波指令信号的无静差跟踪，而且对直流分量具有良好的抑制表现。 |
| 关键词: 直流注入 直流分量抑制 逆变器 并网 闭环控制 积分控制器 直流输出阻抗 频域分析 电流控制 |
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| 基金项目:国家自然科学基金重点资助项目（51237003）；国家电网“千人计划”专项支持项目（PD71-12-017）；国家电网公司基础性前瞻性科技项目（PD71-14-001，PD71-14-003） |
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| DC component suppression strategy for single-phase grid-connected inverter |
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YANG Liang1,2, SU Jian2, LIU Haitao2, LÜ Zhipeng2, WANG Yichao3, HE Jiabei3, WANG Cong1
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1.China University of Mining and Technology，Beijing 100083，China;2.China Electric Power Research Institute，Beijing 100192，China;3.National Electric Power Conversion and Control Engineering Technology Research Center，Hunan University，Changsha 410082，China
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| Abstract: |
| Aiming at the DC injection of grid-connected inverter，the grid-connected inverter with LCL filter is studied and a strategy of current tracking control is presented to suppress its DC component，which adopts the dual closed loop technique to directly control the grid-connecting current. A DC component suppression branch consisting of an integral controller is added to the conventional fundamental current control branch in the outer current-loop，which increases the DC output impedance of inverter to suppress its DC component，without affecting the fundamental current tracking control. The implementation of the proposed strategy is simple because，without DC component detection，only the virtual impedance is connected in series to the output port of inverter，which is infinite to DC component while small to AC frequency. A model is built and the frequency domain analysis proves its DC inhibition performance. The simulative and experimental results show that，the fundamental reference tracking with zero steady-state error is realized and the DC component is well suppressed. |
| Key words: DC injection DC component suppression electric inverters grid-connection closed loop control integral controller DC output impedance frequency domain analysis electric current control |
