基于三绕组变压器的 LCL 型滤波器研究磁

摘要

LCL 滤波器在光伏并网逆变器中得到广泛应用。为了简化传统 LCL 滤波器系统结构、降低制造成本和运行成本、提高系统的可靠性，研究了一种基于三绕组变压器构成的 LCL 型滤波器，其方法是利用三绕组变压器的绕组漏感代替分立电抗器的电感，并与滤波电容相配合构成 LCL 型电路。论文研究这种滤波器的主电路结构、工作原理及参数选择方法。论文研究结果可作为工程应用时参考。%LCL filter is widely used in grid‐connected photovoltaic inverter .In order to simplify the system structure of conventional LCL filter ,reduce manufacturing costs and operating costs ,and improve system reliability ,a new topology of LCL power filter based on three‐winding transformer is developed ,which uses the leakage inductance of the transformer to replace the individual circuit inductance .A three‐winding transformer and filter capacitors constitute LCL circuit .In this pa‐per ,main circuit structure is structured ,working principle is analyzed ,then the method is presented to select the circuit pa‐rameters of proposed filter .Results of this study can be used as a reference for engineering applications .Finally ,Matlab simulation soft is applied to verify studied filter .