The Vector Excitation Realization Of Flexible Power Conditioner Based On Double PWM Converter

Flexible power conditioner (FPC) is a new kind of FACTS equipment which is the organic combination of flywheel energy storing set and synchronization condenser. It has the ability of adjusting the active and reactive power motor output or input swiftly in wide range. This makes it possible to initiatively stabilize the power system. At the same time, this equipment can be fixed dispersedly which offers a new thought and method to enhance the power system stabilities based on the principle of power balance.The excitation controller is the linchpin of FPC to displays its functional characteristics. The advancement in transducer and the vector transformation control theory are technical and theoretical preparations to control the active and reactive power of FPC independently. The main objective of this thesis is to realize the vector control strategy based on stator magnetism direction of FPC. The main content is to design and to debug the double PWM converter. An integrate excitation control set is designed on this basement.In facts of double PWM converter, the SPWM and SVPWM theory and their realization in DSP is introduced in detail. Three models which are based on the three-phase stationary frame and the synchronous rotating frame respectively for inverter are established. A single voltage state feedback control scheme using PID calculation is proposed. Different modulation and control methods are compared and analyzed by the simulation result with PSCAD.Principle used to select the main circuit organ and its parameter is presented. The theory and circuit design of cushion and protection for IGBT, drive circuit theory and circuit design are investigated in detail. The thesis also presents the details of the sampling circuit, the contacts control circuit and the principle to choose the parameter. And then, the developed inverter has been tested by experiment. Satisfactory results obtained verify the effectiveness of the theoretical analysis and the developed equipment.The excitation control model based on stator magnetism direction was proved to be correct by the simulation results with PSCAD. The rotor position check set was fixed to double PWM converter to direct stator magnetism and voltage and the rotor voltage. These make integrated excitation equipment for FPC. According to the excitation control flow chart, the modulation is operated in three steps. The cut-in feasibility testified the excitation control and equipment. Farther experimentations are in processing.