The System Design Of Single Phase Self-excited Asynchronous Generator And The Study Of Its Constant Voltage Output And Its Load Capacity

Portable power supply with high reliability is essential under high technology war. Because of characteristic of the single-phase asynchronous generator (SPAG), the SPAG is one of the ideal applications for troops. For example, its rotor is consisted of iron core with aluminum bar and the SPAG is light and has the simple structure without the brush and slip ring, which results in the fact that the SPAG is able to work with high reliability and ruggedness. So, we expect that the special SPAG is designed for the troop. And this research is significant for military use. However, as the single-phase asynchronous motor is used for the generator, the low efficiency, the great variation of the output voltage and the worse load characteristic and low load capacity are existed in the motor. So, the generator has the bad performance compared with the synchronous generator, which results in the fact that the existing SPAG is not widely acceptable. First, current states of the SPAG and analyzing issues related with the SPAG such as the system design, the constant voltage output, the feature and capacity of the loads are described in this thesis, and then the thesis presents the energy conservation iteration method (ECIM), which eliminates the existing problems in the conventional design method for the SPAG with Newton-Raphson method. The theory related with the SPAG has been analyzed in detail and the simulation algorithms about the steady characteristic, the constant output voltage and the load characteristic of the SPAG have been studied. Finally, the design method for the SPAG is also presented. The algorithm and the design method are verified with the experiment results and they have been used in the military projects. These fruits are given in the following. 1. Newton-Raphson method is the conventional design method for the motor design. However, it is not great useful for the SPAG design because it is very difficult to develop the exact model of the SPAG, which Newton-Raphson method depends on greatly. So the conventional design method with Newton-Raphson is not able to achieve the good results for the SPAG. The thesis presents a novel design method that is called energy conservation iteration method (ECIM). It is not necessary to build the SPAG model when the ECIM is used to design the SPAG. So the problems related with the SPAG can be analyzed easily. The ECIM is the creative method in motor design. 2.It is the fact that the voltage across the existing single-phase self-excited asynchronous generator (SPSEAG) is unstable. The thesis makes the detailed analysis about the unstable voltage. In order to make the solution for the problem, the method of the load capacitors parallel connected is put forward. At the same time, the method is also put forward to determine the values of the capacitors series connected. The above methods are confirmed with a lot of experiment results. The thesis also presents the scheme of the self-adapting excitation system firstly, which is consisted of the capacitor with the fixed value in series with the SPSEAG and the capacitors with the small adjustable capacitor paralleled with the SPSEAG. As the unstable output voltage is a technical puzzle for years, many studies have been carried out over the world. Now, the method presented in this thesis is the better solution for keeping the constant voltage across the SPSEAG. 3.The load characteristic and capacity of the SPSEAG are decided by the simulation design, which is the creation for the SPAG design and meets wide requirements. The design SPAG makes it possible that expands SPAG in many application fields. The results of this thesis provide the academic base for the development of SPAG. The thesis has made the better solution for the technical puzzle of the SPSEAG, such as the low efficiency, the unstable voltage and the worse characteristic and the low capacity of the load. In two military exercises the designed SPSEAG is used as the electric source, the loads of which are both the resistance such as lamps and the inductance such as the pump machine. It has been proven that the designed SPSEAG with high reliability, high efficiency, better characteristic and high capacity of the load is widely acceptable in the troops. The designed SPSEAG is to equip the troop. The academic results of the thesis are going to apply to the projection.