无磁链观测的电力动负荷物理模拟关键技术研究

Key Techniques Research for Physical Simulation of Dynamical Electric Loads Without Flux Linkage Observation

电机性能及电源装置性能的测试试验,需要一套高效、实用的动负荷模拟系统。为此,提出了一种无需磁链观测的电力动负荷物理模拟方法,针对3种常见类型的电动机机械负载的模拟控制问题,给出了负荷模拟系统的总体结构,建立了控制系统的数学模型。采用保持励磁恒定,调节电枢电流来模拟不同类型动负荷的控制策略。借助PSCAD对模拟系统进行了仿真实验验证,结果表明模拟系统能够有效地对恒转矩、恒功率和风机类机械特性负载进行精确的动态模拟。

For the purpose of testing the performance of motors and power units, an efficient and practical system capable of the emulation of dynamical electric loads is needed. In this paper, a method for physical simulation of dynamical electric loads without flux linkage observation is presented. The paper describes the model and the dynamic equation of the control system, which is capable of emulating three kinds of mechanical load. By the method of maintaining a constant excitation and adjusting armature current of the DC machine, this paper gives the way to simulating different kinds of load. The control strategy is emulated by PSCAD, and the results show this system can precisely simulate the dynamical load of constant torque, constant power and fan-type.