Sensorless Indirect Control Method of Active Power Filter Considering the Correlation of Submodules

The current sensorless indirect control nodes of active power filters are mostly unidirectional structures, and the indirect control range is small, leading to the extension of the response time of the indirect control. Therefore, the design and verification analysis of the sensorless indirect control method of active power filters considering the correlation of submodules are proposed. According to the actual sensor indirect control requirements and standards, the indirect control indicators are set first, the actual control range is then expanded in a multi-level manner, and multi-level indirect control nodes are further deployed. On this basis, a sensorless indirect control module of the power filter is built, taking into account the submodule, and adaptive error correction is used to achieve indirect control processing. The test results show that through the test and analysis of the selected five nodes, the final indirect control response time is 0.5 s and rather well controlled, which indicates that the current sensorless indirect control of the active power filter is better and more targeted in the face of complex background environment and that it can further strengthen the actual control effect and the control of indirect error, which has practical application value.