Three-Phase PWM Rectifier Control System Design

The tidal current generator set has the characteristics that the amplitude and frequency of the generated Alternating Current (AC) change with the tidal current velocity in real time, so based on this issue improve the control strategy for three-phase Voltage Source PWM Rectifier (VSR). Introduce the variable exponential convergence law into the voltage outer loop Sliding Mode Control (SMC), and introduce the Phase Locked Loop (PLL) technology into the current inner loop Predictive Current Control (PCC). Build a simulation platform in Matlab/Simulink software, compare and analyze the improved control strategy with the traditional PI control and "SMC+PCC" control, finnally draw the conclusion that it has significant advantages in response speed and anti-interference ability. The result also verifies the feasibility of using this control strategy for three-phase VSR to convert unstable AC power generated by power flow generators into stable Direct Current (DC) power.