Deviation decouple control method based on disturbance observer

To solve the problem of non-ideal dynamic decoupling result with traditional method in dq coordinates when inductor parameter changes, a kind of deviation decoupling control method based on disturbance observer is proposed. This method regards inductor parameter change and voltage error caused by current coupling as disturbance of the system, using a disturbance observer to observe, and the observed values are regarded as compensation signal feedback to the input to offset the effect of disturbance on system. Frequency characteristic of disturbance observer is used to adjust the amplitude and phase frequency response of controlled target, even if the system parameters change, it can also make the controlled target normalization. The method not only realizes dq current coupling but also restrains disturbance, when parameters change, system is strongly robust, and has a good dynamic performance. Simulation analysis and experiments are done to compare the traditional decoupling method and the new method, then the results verify the feasibility and effectiveness of the method.