【作者】 崔立冬；

【导师】 王祁；

【作者基本信息】 哈尔滨工业大学 ， 仪器科学与技术， 2011， 硕士

【摘要】 电源系统阻抗是衡量直流电源系统稳定性的重要技术参数,对电源系统的设计与稳定性分析具有极大的现实意义。通过对阻抗的稳定性理论及其测试方法的研究进行仿真软件设计,很好的将稳定性理论应用于实际的电源系统设计与稳定性分析中,同时避免了在线测试的不便及对正常运行系统的影响。因此,直流电源系统阻抗计算仿真软件的研究与设计具有一定的实际价值与应用前景。本文主要从直流分布式电源系统稳定性理论、研究方法、系统模型及实验分析等方面进行探索性研究。从基本理论、软件仿真、电路实验角度研究了阻抗匹配关系对直流电源系统稳定性的影响,为了验证阻抗判据的正确性与仿真软件的可靠性采集了多组实验数据,通过比较分析总结了电源输出阻抗与负载输入阻抗随频率的变化规律,在阻抗关系不满足6dB判据情况下用实时波形与数据分析了产生不稳定现象的原因。在对直流分布式电源系统特点及阻抗理论研究的基础上,建立了母线电压、电流及激励电流信号的数学模型,设计了计算仿真软件,实现了两方面的仿真功能:母线电压仿真测试与多负载情况下的负载阻抗指标分配。在给定电源输出阻抗与负载输入阻抗时可以仿真得到母线电压时域与频域波形,在给定电源负载功率数据时可以对各个负载提出稳定性的阻抗指标。电源系统阻抗测试是稳定性研究中的难点,本文论述了阻抗测试系统的基本原理,搭建了测试实验电路,对实验结果及误差产生的原因进行了具体的分析,验证了阻抗判据的正确性与仿真软件的实用性。更多还原

【Abstract】 Power system impedance is an important technical parameter to measure stability of DC power system (DPS), this parameter is of great practical significance to DPS design and stability analysis. Simulation software based on research of impedance stability theory and testing method make stability theory applied to practical power system design and stability analysis, at the same time, using of simulation software avoids the inconvenience of online testing and Impact to normal operation system. So the research and design of simulation software have some practical value and application prospect.In this paper, we have mainly exploratory research in DPS’stability theory, research methods, the system model and experimental Methods. We research the impact of impedance matching to DPS’stability from basic theory, software simulation and circuit experiment, in order to verify the accuracy of impedance criterion and the reliability of simulation software, we acquire multiple sets of experimental data and summarize frequency characteristics of power supply output impedance and the load input impedance by comparing. This paper analysis reasons of instability when impedance relation does not match the 6dB criterion.Based on the research to DPS’characteristics and impedance theory, this paper builds mathematical models of bus voltage, bus current and excitation current signal. The simulation software achieves two functions: bus voltage simulation test and index distribution of load impedance. The simulation software can output time domain and frequency domain waveforms of bus voltage when given power output impedance and input impedance, what’s more, it can propose stability impedance indicator when given power data of source and loads.Power system impedance testing is one of difficulties in stability study, this paper discusses the basic principle of impedance test system, designs experimental circuit and verifies correctness of impedance criterion and practicality of Simulation Software by detailed analysis to experiment results and data errors.更多还原