无源性非线性控制策略的研究与应用-《计算机技术与发展》

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Keywords:: current-source inverter; passivity-based control; damping injection; nonlinear control

摘要:: 针对传统控制器在设计时常忽略与系统能量相关的问题，文中给出一种无源性控制策略，并将其应用于阻性负载的单相电流型PWM逆变器中。该控制策略主要是从能量角度分析逆变系统，根据在系统中注入阻尼，重新分布逆变系统能量的方法，使系统能够全局稳定。该方法无需将系统中的非线性因素完全抵消，即可实现电压、电流的渐近跟踪。仿真结果证明此无源性控制策略具有较好的鲁棒性，以及良好的稳态和动态性能，即使负载发生大范围变化，系统仍能保证稳定运行。据此也说明所述方法的正确性和有效性

Abstract:: As the design of traditional controller often ignores the problems associated with the energy of the system,propose a passivity-based control strategy for single-phase PWM current-source inverters feeding a resistive load. The key point of this strategy is to analyze the control system from the energy aspect and ensure the stability of the global system according to the redistribution of the energy by in-jecting damping in needed. This method tracks the voltage and current asymptotically without offsetting the nonlinear dynamic characteris-tics of the system. The results of simulation are demonstrated to prove that the proposed control strategy provides good robustness and well steady state operation and dynamic response,even though the load changes in a wide range,the nonlinear controller can make system op-eration steadily. Pursuant to which also shows the correctness and validity of the control strategy described in this article