| 引用本文: | 王要强,吴凤江,孙 力.并网逆变器用LCL滤波器新型有源阻尼控制[J].电力自动化设备,2011,31(5): |
| WANG Yaoqiang,WU Fengjiang,SUN Li.Active damping control strategy for LCL filter used in grid-connected inverter[J].Electric Power Automation Equipment,2011,31(5): |
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| 摘要: |
| 针对并网逆变器用LCL输出滤波器的不稳定性，在分析LCL滤波器无源阻尼控制算法的基础上，提出了一种基于电容电流估计的三闭环LCL滤波器有源阻尼控制算法。算法引入电容电流内环以抑制系统不稳定的现象，电容电流信号通过估计过程得到。定性分析了提出算法的稳定性。因省去了以往无源阻尼控制算法中用以抑制系统谐振而增加的阻尼电阻，而从根源上消除了滤波器滤波性能、系统效率降低和发热等问题。所提算法无需增加额外的传感器。仿真和实验结果证明了所提算法的有效性与可行性。 |
| 关键词: 并网逆变器 LCL滤波器 有源阻尼 电流估计 |
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| Active damping control strategy for LCL filter used in grid-connected inverter |
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WANG Yaoqiang, WU Fengjiang, SUN Li
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Department of Electrical Engineering，Harbin Institute of Technology，Harbin 150001，China
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| Abstract: |
| Aiming at the instability of LCL output filter used in grid-connected inverter，its passive damping control algorithm is analyzed and the triple close-loop active damping control algorithm based on capacitive current estimation is proposed. The capacitive current inner loop is used to suppress system instability and the capacitive current is obtained by estimation. The stability of the proposed algorithm is qualitatively analyzed. Since the damping resistor used in the passive damping control algorithm is omitted，the problems of filter performance degradation and system efficiency degradation are avoided. No additional sensors are needed. Simulative and experimental results validate the effectiveness and feasibility of the proposed algorithm. |
| Key words: grid-connected inverter LCL filter active damping current estimation |
