非线性动力学在电力电子学中的一些开拓

【作者】 朱宁；

【导师】 吴为麟；

【作者基本信息】 浙江大学 ， 电力系统及其自动化， 2004， 硕士

【摘要】 本文分析了电力电子基本DC-DC变换器的非线性动力学现象。文中研究了原有经典模型的不足，在此基础上，引入了离散时间模型。闭环系统的模型建立成功，并用于分析比例、积分、比例积分和比例积分微分控制回路的分析。分岔与混沌的现象在电压控制的功率变换器中产生，文中指出了它们对稳定性分析的意义。 本文还分析了带有输入滤波器的系统稳定性问题，广泛使用的小信号平均模型还存在一定的缺陷。 在高电压、大电流高频电路的情况下，对电路检测和监视有一定的困难。作者引入了一种新的复杂性分析的方法，利用综合性信号监测电路故障状态。与传统的方法相比，该方法具有快速、简便、经济、安全、非破坏性等优点，可作为电路系统可靠性预测的手段。 本文还使用参数微扰方法控制电流控制模式boost变换器在连续电流模式下产生的混沌行为。文中利用离散模型确定了系统运行的混沌区域，并在设计控制环时作了适当的简化，以利于实现。仿真分析和实验都显示，这一方法对于开关电路是有效的。电路的稳定被重新建立，并在此基础上进一步扩大了变换器的工作范围。本文也分析了噪声在控制中的影响。更多还原

【Abstract】 Nonlinear dynamics in basic power electronic circuits is investigated in this thesis. Based on the limitations of the previously established classic model, a new approach of discrete-time modeling method is adopted. This model is successfully used in close-loop regulator system. Dynamic behaviors of regulators with different control loop designs are studied. The compensators studied are proportional, integral, proportional-integral, proportional -integral-derivative feedback controllers. Bifurcation and chaos behaviors are presented with the voltage controlled converter. Their influence on stability is analyzed.The interactions of input filters with DC-DC regulators are investigated as well. The widely used small-signal averaged model does not provide complete understanding of the stability.In the condition of high-voltage, heavy-current and high-frequency electric circuit there is a certain difficult to inspect and supervise the electric circuit. On introducing a new method of complexity measure analysis, the authors manage to inspect the circuit fault status by analyzing synthetic signal. Compared with the traditional method, the present method has the advantages of high speed, easy operation, less expenses, safety, no destruction, etc. and can be used as a reliability predicting measure for electric circuit system.OGY method is applied to control the chaos exhibited by current-mode controlled boost dc-dc converter, as its chaotic regime has been established in this paper. This is achieved by using discrete-time model and making simplification of the control loop design. Both simulation and experimental work are done. Stability of the circuit is obtained, so that this control method proves to be valid in controlling switching circuit.更多还原