谷值电流控制的H桥逆变器的非线性现象

Nonlinear phenomenon in H-bridge inverter by valley-current control

逆变器是一种强非线性系统,存在丰富的非线性现象,非线性会导致系统运行不稳定.分析谷值电流控制的H桥逆变器的工作原理,运用频闪映射方法建立该逆变器的离散模型.利用频闪图、分岔图、折叠图及Lyapunov指数谱,分析该逆变器出现的非线性现象.采用Jacobian矩阵法,阐述系统稳定性发生变化的原因.研究结果表明,该逆变器中存在非线性现象.研究结论对于谷值电流控制的H桥逆变器的设计有理论意义及工程价值.

The inverter is a kind of strongly nonlinear system, which has rich non-linear phenomenon and can lead to operating instability. Therefore, the working principle of the H-bridge inverter by valley-current control was analyzed in this paper. The discrete reflection method was adopted to establish the discrete model for the inverter. The nonlinear phenomena appearing in the system was described by using stroboscopic graph, bifurcation diagram, folding chart and Lyapunov index spectrum. The Jacobian matrix method was used to analyze the reason of the system stability change. The results indicated there existed the nonlinear phenomenon in the inverter. The study had theoretical significance and engineering value for designing the H-bridge inverter by valley-current control.