发电用微型燃机PWM整流器自适应H_∞控制

Adaptive H_∞ Control of Voltage PWM Rectifier for Microturbine Power Generation

通过分析发电用微型燃机系统中PWM整流器的工作原理和永磁同步发电机模型,建立了PWM整流器模型,组成了基于有功和无功理论的功率控制系统.考虑微型燃机发电系统容量小,受负载波动影响大,以及负载不确定性的特点,在功率控制的基础上,提出了直流侧电压自适应H∞控制方案,在李亚普诺夫稳定意义下,通过自动补偿负载变化,实现直流侧电压稳定和高功率因数.仿真和实验结果表明:应用自适应H∞控制时,在保证高功率因数的基础上,直流侧电压波动范围很小,从而验证了所提方案的有效性和实用性.

Analyzing the operating principle of PWM rectifier and the model of a permanent magnetic synchronous generator in a microturbine power generation system,a model of PWM rectifier was developed with a power control system provided theoretically on the basis of active/reactive power. Considering the low capacity of the power generation system and the wide fluctuations of uncertain loading,an adaptive control strategy for DC-controlled voltage was proposed on power control basis. Then,the stable DC-controlled voltage and high power factor will both be implemented in the sense of Lyapunov stability via the auto compensation for loading change. Simulation and test results both showed that the adaptive control can make the fluctuations of DC-controlled voltage in narrow range with high power factor provided,thus verifying the effectiveness and practicability of the strategy proposed.