Research On Static Reactive Power Compensation Of Self-excited Asynchronous Generators

Along with the development of electric power technology, self-excited induction generator with its unique advantage, it attracts more and more attention from all walks of life in favor of, in the field of power can not only solve the problem of power supply in remote areas, in the wind, hydro and other clean energy power generation field application has become more widespread.In ships, military and other fields, all electric ships, all electric aircraft, electric tank concept promotion and put into practice, application of self-excited induction generator to a new height. But the self-excited induction generator has a distinct lack of, is with a load capacity of poor, when there is a change of load, generator terminal voltage is not stable, the reliability of the power supply can not, the reason is self-excited induction generator system of reactive power is insufficient and need for reactive power compensation to stabilize terminal voltage.Static reactive power compensation device with its mature technology, special compensation flexibility, convenient, fast, continuous without compensation. This paper will explore the self-excited induction generator with the TCR-TSC type static reactive power compensation device, through policy and experiment validate the feasibility.According to the mathematical model of asynchronous generator, through coordinate transformation and formula deduction describe in detail by means of the principle of maintaining the voltage stability of the asynchronous generator, introducing the concept of reactive power compensation to the terminal voltage of generator, by analyzing the influence of the variation of each quantity on the terminal voltage, the principle of the terminal voltage of reactive power compensation is expounded, and the calculation methods of the capacity of TCR-TSC type static reactive power compensation device are given.The basic principle and structure of TCR type static reactive power compensation device are introduced, deducing and analyzing the relationship between the equivalent of TCR and the trigger delay angle, TCR circuit is described briefly.Structure and principle of TSC, selection of cutting time. Structure of TCR-TSC type static reactive power compensation device, introduction of control from TCR, the control principle, the control strategy and the dynamic performance of the TCR-TSC static var compensator are described in detail in the TCR-TSC type static var compensation device.According to the selected control strategy and compensation model, the hardware design of the experimental platform is designed, including voltage sampling circuit withfiltering function, thyristor digital trigger circuit, etc. And basis on this, the software program for TMS320F28335 is designed.Verified in the maintenance of self-excited induction generator terminal voltage stability when the system starts from the two aspects of simulation and experiment, feasibility of using static var compensator. Proportional integral controller for reactive power compensation, the voltage deviation can be eliminated after reaching steady state.And by comparing the simulation results with the experimental results, we can find a perfect place to design the experiment, for example, using a more reasonable filter and some components,etc.