Abstract
Aim at solving the complex computation and complicated circuit of grid-connected converter, the sliding mode variable structure theory is introduced into its direct instantaneous power control. By analysis and modeling of three-phase grid-connected converter with an LCL-filter, sliding mode variable structure control is constructed with the active power and reactive power. The chattering is weakened by using the exponential reaching law. Cost of LCL grid-connected converter system is reduced at the same time when unit power factor and low harmonic distortion are realized. In order to increase the stability of the system, the virtual flux variable is integrated with the sliding-mode variable structure direct power control algorithm, and the improved first-order low pass filter virtual flux is used to remove the voltage sensor. By simulation, the effectiveness and feasibility of the control method is proved.
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