单相PWM整流器电压外环模糊自适应控制

Fuzzy adaptive control strategy of voltage outer loop for single-phase PWM rectifier

为了提高单相PWM整流器输出电压的质量,解决传统控制策略存在参数整定困难的问题,改善小型能源路由器中间级的输入电压,提出了电压外环模糊自适应控制策略。首先,根据电路特征,建立单相PWM整流器的最优数学模型;其次,将模糊控制思想引入电压外环控制策略中,与传统的PI控制相结合,针对传统PI参数的影响,构建模糊规则,计算模糊因子;最后,与比例谐振控制结合,给出了单相PWM整流器电压外环模糊自适应控制。结果表明,所提出的控制策略具有良好的动态特性,可以在一定程度上减少负载波动时输出电压的波动,且在单位功率因数条件下,能够实现整流器的整流或逆变。改进策略可为小型能源路由器能量双向传输方面的研究提供参考。

In order to improve the output voltage quality of single-phase PWM rectifier,solve the shortcomings of parameter setting difficulties in traditional control strategies,and improve the input voltage of the intermediate stage of small energy routers,a voltage external loop fuzzy adaptive control strategy is proposed.Firstly,according to the circuit characteristics,the optimal mathematical model of single-phase PWM rectifier is established.Secondly,the idea of fuzzy control is introduced into the voltage outer loop control strategy.Combined with the traditional PI control,the fuzzy rules are constructed according to the influence of traditional PI parameters.The fuzzy factor is calculated.Finally,combined with the proportional resonance control,the fuzzy adaptive control of the voltage outer loop of the single-phase PWM rectifier is given.The experimental results show that the proposed control strategy has good dynamic characteristics,which can reduce the fluctuation of output voltage when the load fluctuates to a certain extent,and can realize the rectification or inversion of the rectifier under the unit power factor condition.It is in line with the two-way transmission requirements of the small energy router.