CAJ | 학술논문

针对数字控制单相全桥电压型逆变电路的非线性动力学特性分析,本文建立了一种改进离散迭代模型.改进离散迭代模型结合了平均模型和传统离散迭代模型的优点,能够精确分析数字控制延时以及采样保持过程对系统非线性动力学特性的影响,可以在保证精确度的前提下显著降低离散迭代建模过程的复杂程度.本文以LC滤波器电容电压外环、电感电流内环反馈加给定电压前馈的数字控制系统为例,建立了数字控制单相全桥电压型逆变电路的改进离散迭代模型,采用新模型分析了系统的非线性动力学特性,并准确预测了系统的稳定范围以及失稳现象.最后,利用SIMULINK仿真模型和物理实验验证了改进离散迭代模型的正确性和有效性.
침대수자공제단상전교전압형역변전로적비선성동역학특성분석,본문건립료일충개진리산질대모형.개진리산질대모형결합료평균모형화전통리산질대모형적우점,능구정학분석수자공제연시이급채양보지과정대계통비선성동역학특성적영향,가이재보증정학도적전제하현저강저리산질대건모과정적복잡정도.본문이LC려파기전용전압외배、전감전류내배반궤가급정전압전궤적수자공제계통위례,건립료수자공제단상전교전압형역변전로적개진리산질대모형,채용신모형분석료계통적비선성동역학특성,병준학예측료계통적은정범위이급실은현상.최후,이용SIMULINK방진모형화물리실험험증료개진리산질대모형적정학성화유효성.
An improved discrete-time model for a digital controlled single-phase full-bridge voltage inverter is proposed in this paper. Based on state-space averaging in every switching cycle, the improved discrete-time model combines the advantages of the average model and the traditional discrete-time model, which can accurately analyze the digital control delay and sample-and-hold process inherently in digital controlled system. Consequently, under the accuracy premise, the improved discrete-time model can effectively simplify the traditional discrete-time modeling. As an example, an LC filter capacitor-voltage and inductor-current feed-back plus voltage-reference feed-forward control algorithm is analyzed based on the improved discrete-time model. The stability boundary and oscillation frequency are accurately predicted. Finally, theoretical results are verified by simulations and experiments.