交直流电力集成技术

AC-DC Power Integration Techniques

建立了新型电机的数学模型 ,为解决关键技术问题提供了理论基础。查明了发电机整流系统特有的低频功率振荡的机理 ,得出了稳定判据及解决稳定问题的技术措施 ;通过合理设计 ,可控制直流电压的浮动范围 ;综合治理整流过程引起的交流谐波和直流脉动 ,提高了系统的EMC性能 ;巧妙地处理了系统的强非线性 ,从而得出了直流短路和交直流同时短路的冲击电流解析式 ;提出了根据整流装置输入、输出电压波形进行实时在线故障诊断的原理和方法。在此基础上 ,将定子 3相绕组、 12相绕组、整流装置、励磁系统、励磁调节器等集于一体 ,成功研制出性能优良的交直流发电机 ,能同时提供高品质交直流电源 。

A novel AC-DC machine is invented on the basis of the proposed new idea of electric power integration, wherein the stator with one set of 3 phase AC winding and another set of 12 phase DC winding, together with a rotor having a d axis field winding and a q axis stabilizing winding, is combined with a 12 phase bridge rectifier, an AC exciter with an excitation system, the automatic voltage regulator as well as a cooling system to form an integral whole. Simultaneous AC and DC power supplies with high quality being available, this new generator is especially suitable for self contained electrical systems, such as those found on aircraft and ships, where good performance and compact size are essential. Mathematical models of the machine are established and calculation and measurement methods of the model parameters are proposed, providing a theoretical basis for solving the key technical problems. Low frequency oscillations occurring in a synchronous generator rectifier system are examined, stability criterion of the system is obtained, and technical measures are proposed to ensure system's stable operation. With the AC voltage regulated, the DC voltage floats within an acceptable range, which can be achieved through rational machine design. Due to complete electrical separation of the AC and DC circuits and usage of the properly designed 12 phase DC winding, the AC voltage distortion caused by DC commutation and the DC voltage pulsation are greatly reduced, which considerably improves the EMC of the system. Expressions for the peak current and impact torque following a short circuit fault at DC side or at both AC and DC sides are derived once the strong nonlinearity of the system is ingeniously handled. The principle and methods for on line real time fault diagnosis of the diodes in the 12 phase rectifier are proposed so that the state of each diode can be easily judged according to the input/output voltage waveforms. Based on the achievements of above research, AC-DC generators with high performance have been developed, laying the foundation for integration of self contained electrical systems. [