Passivity Control And L2 PWM Rectifier Disturbance Suppression Technology

With the widespread using of the PWM Rectifier, the harmonic pollution to grid and electrical equipment is greatly reduced. By combining with the control strategy, the PWM Rectifier can own superior performance, also maintain stability in a wider range of interference.Based on PWM Rectifier’s characteristics, we use the Passive-Based Control strategy to the design the PWM rectifier’s controller, and when the load side is linked with back-EMF (Electromotive Force) also carried out the analysis and control. Also for PWM Rectifier load resistance perturbation problem, we use L2gain disturbance rejection control to solve it. The main work is as follows:First, in the process of using the Passive-Based Control strategy to control the PWM Rectifier, we described its circuit topology, the mathematical model and the general state average mathematical model in the dq rotating coordinate system:then introduced the passivity control theory, and elaborated PCH (port-controlled Hamiltonian, PCH) state control principle and method for solving controller; Finally, we conducted a simulation study of the system.Second, the load side with a back-EMF of the PWM rectifier systems modeling and analysis, and to establish its PCHD system based on this model, and then use the state PCH method to solve the controller; finally conducted a simulation study of the system.Third, there is the network side voltage and switching function of two control inputs to solve the corresponding PWM Rectifier modeling analysis and controller:and interference with PWM rectifier load resistance mutations caused by the system based on this, by design corresponding L2gain disturbance rejection controller to be suppressed. Simulation results show that L2has a good interference suppression capability.Fourth, the vector control strategy based on PWM rectifier modeling and simulation, and the simulation results are compared with the simulation results based on PWM rectifier PCH control, indicating better static and dynamic performance control PWM rectifier Based on PCH, more fast output voltage tracking speed and stronger anti-interference ability.Through the simulation, we know that, the PWM Rectifier based on passivity control can easily realize it’s objectives, also has strong stability and dynamic performance:when the PWM Rectifier’s load side is linked with a battery, the system can provide a constant charging voltage for the battery by limiting the current; by using L2gain disturbance rejection control technology, we can eliminate the PWM Rectifier System’s steady-state error which caused by the load resistance’s wide range.