Voltage Stabilization Control For Dual Three-phase Permanent Magnet Synchronous Generator Based On Cascaded Linear Active Disturbance Controller

The dual three-phase permanent magnet synchronous generator(PMSG)has important application value in DC power generation systems of advanced equipment due to its advantages of high power density and strong fault tolerance performance.To enhance the system’s ability to resist load variation,this thesis proposes a dual three-phase PMSG voltage outer loop control method based on linear active disturbance rejection controller.This method is based on the architecture of a dual three-phase PMSG system and the power balance equation of the AC and DC sides.All disturbance terms are defined as the total disturbance,and the system states are observed for feedback control,and compensated for difficult to calculate losses and various disturbances in modeling through a linear active disturbance rejection controller.To improve the voltage response performance of the power generation system in the presence of bus voltage measurement noise,this thesis proposes a cascaded linear active disturbance rejection controller based on filter compensation for voltage control.Low pass filter is commonly used to filter out the noise in voltage signal,but it also results in the phase and amplitude loss of the signal.This method defines the output and filtering loss of the low-pass filter as a new state variable of system,and introduces a cascaded linear active disturbance rejection controller to estimate the system state variables and compensate for filtering losses.Compared with traditional linear active disturbance rejection voltage stabilizing control,this method can further shorten the voltage recovery time and enhance the system’s performance of resisting load disturbance.This thesis verifies the effectiveness of the proposed methods from various aspects such as theoretical analysis,mathematical modeling,simulation and experiments.The main research contents of this thesis are as follows.1.The topology of the dual three-phase PMSG rectifier power generation system is briefly analyzed,the mathematical model of the PMSG based on vector space decoupling method is established,and the components in the fundamental subspace are transformed into the rotor rotation coordinate system.The AC and DC power balance equations are derived,and the space voltage vector modulation strategy and vector control method of the PMSG are introduced.2.The voltage stabilization control strategy based on proportional integral(PI)controllers is explained,and the design process of voltage outer loop and current inner loop based on PI are introduced.The basic principle of active disturbance rejection control is introduced,an active disturbance rejection voltage stabilization control method based on the AC and DC power balance equations is designed,and a simulation model is built to verify the control performance of the proposed method.3.The influence of voltage measurement noise on the extended state observer is analyzed.To solve the problem that the voltage measurement noise affects the dynamic performance of the system,a cascaded linear active disturbance rejection voltage stabilization control strategy based on filter compensation is proposed.This strategy defines the filtering loss caused by the low-pass filter as a new state variable,and designs a cascaded linear active disturbance rejection controller to observe each state and compensate for the loss.A model is built for simulation verification.4.A generation experimental system based on dual three-phase rectifier is designed,and its key hardware circuit design and software algorithm flow for PMSG control are introduced.A dual three-phase PMSG power generation experimental platform is built to verify the control strategies proposed in this thesis.