欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
LCL滤波器对开关谐波具有很强的抑制能力，被广泛应用于并网逆变器中。为了抑制LCL滤波器的谐振尖峰，通常采用电容电流反馈进行有源阻尼。但是采用数字控制时，反馈信号的采样和控制算法的计算会引入一拍滞后的延时，改变有源阻尼的特性，使得控制系统对电网阻抗的鲁棒性较差；同时，该延时还会降低系统的相位，严重限制并网电流环的环路增益和带宽的提高。为此，提出双采样模式的实时运算方法，完全消除了有源阻尼内环和并网电流外环的计算延时，因此可大大提高并网逆变器的系统鲁棒性和电流控制性能。同时，与传统方法相比，双采样模式实时运算方法还可延长采样时刻与开关管开关时刻之间的时间间隔，从而有效地避免了高频开关噪声对采样信号的影响，提高了逆变器的抗噪性能。以单相LCL型并网逆变器为例，进行实验验证。实验结果证明了所提出的双采样模式实时运算方法是有效的。
英文摘要：
Due to the higher attenuation of the switching frequency current harmonics, LCL filter has been used widely in the grid-connected inverter. To deal with the resonance of the LCL filter, the capacitor current feedback is usually adopted to damp the resonance actively. However, the one step delay caused by digital computation has a significant influence on the active damping method, resulting in poor system robustness. Meanwhile, the control delay also reduces the loop gain and the control bandwidth greatly. In this paper, a real-time computation method with dual sampling modes was proposed to remove the computation delay from the inner-loop and the outer-loop simultaneously, thus the system robustness and the current control performance can be greatly improved. Moreover, the time duration between sampling instant and the switching actions was extended by the proposed method, which effectively prevents the high frequency switching noise distorting the sampling signals. Therefore the noise-immunity of the inverter was also improved greatly. Experimental results from a 6kW LCL-type single-phase grid-connected inverter confirm the theoretical expectations and the effectiveness of the proposed solutions.
同期刊论文项目
同项目期刊论文
Small-signal modelling and analysis of wind turbine with direct drive permanent magnet synchronous g
Pulse width modulation AC/DC converters with line current harmonics minimisation and high power fact
Zero-Voltage-Switching PWM Full-Bridge Converter Employing Auxiliary Transformer to Reset the Clampi
Symmetrical short circuit current characteristics of doubly fed induction generator wind turbine wit
Full Feedforward of Grid Voltage for Discrete State Feedback Controlled Grid-Connected Inverter With
Multiple-Complex Coefficient-Filter-Based Phase-Locked Loop and Synchronization Technique for Three-
Improved current regulation of three-phase grid-connected voltage-source inverters for distributed g
Flexible Control of Three-Phase Distributed Generation Systems for Voltage Rise Mitigation in Microg
期刊信息
位置：