Constant Voltage Control Of Induction Generators Based On SVC-MERS

Because of the depletion and pollution of traditional energy, the exploitation of clean andrenewable energy is of essence to further energy development. In the development ofrenewable energy, the choices of the generators and the power technology research are thecore part. There are two kind of generators: synchronous generator and induction generator.Compared to synchronous generator, induction generator owns the advantages of small size,low price, easy maintenance, and simple control, etc. However, the induction generator outputvoltage will decrease as the load improves, one of way to stable the generator output woltageis to offset the reactive power of internal consumption.This thesis places squirrel-cage induction generator as research subject and establishesthe steady-state and dynamic models of the asynchronous generator. The research analyses thepower distribution and cut method of different squirrel-cage induction generators’ paralleloperations. The thesis adopts the Static Var Compensator-Magnetic Energy RecoverySwitches (SVC-MERS) technology to stabilize the output voltage of the asynchronousgeneration system. Magnetic Energy Recovery Switch (MERS) is installed in parallel withfour bridge-connected switchs and a capacitor, which could be equivalent to a continuouschange capacitor through switching control. MERS-based parallel reactive powercompensation circuit device withstand voltage by increasing the use of relatively small DCcapacitor high reactive power output, and the circuit operates at soft-switching state with lowloss.The thesis designed three SVC-MERS operational models’ control algorithm through theSVC-MERS simulation with PSIM, which provides theoretical basis for the inductance andcapacitance design of SVC-MERS. Furthermore, the thesis also builds the asynchronousgenerator sets (11kW and4kW) experimental system on Expert3, based on the PE-VIEW9integrated development environment for SVC-MERS software design. The experimentalresults verify the correctness and feasibility of the theory and design proposals to meet therequirements of practical application.