A hybrid fuzzy current regulator for three-phase voltage source PWM-inverter

Guang-Da Chen, W. Cai, Tian-Fu Cai, Hai-Feng Liu
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引用次数: 5

Abstract

This paper presents a fuzzy logic strategy for the current control of a three-phase voltage source power PWM-inverter. The base of this regulator is a direct digital predictive loop which has a very good dynamic performance, but the steady state performance will heavily depend on the accuracy of the model structure and plant's parameters. To reduce the steady errors and compensate the system uncertainties, a feedforward control loop and a fuzzy logic algorithm are introduced. The direct digital predictive loop with the feedforward loop, which can be seen as a hybrid current regulator, generates the command voltage based on the nominal system conditions, guarantees the system with a very fast dynamic response and a smaller system error. The fuzzy logic algorithm, by measuring the amplitude and phase angle of the system error, generates a modifying signal to correct the gains of the direct digital predictive loop and the feedforward loop. When the difference between the reference and actual signals is larger than a given threshold, therefore it minimizes the effects of system uncertainties. Simulation results are presented to verify the effectiveness of the current regulation algorithm.
三相电压源pwm逆变器的混合模糊电流调节器
提出了一种用于三相电压源功率pwm逆变器电流控制的模糊逻辑策略。该调节器的基础是一个直接数字预测回路,具有很好的动态性能,但稳态性能很大程度上取决于模型结构和对象参数的精度。为了减小系统的稳态误差和补偿系统的不确定性,引入了前馈控制回路和模糊逻辑算法。直接数字预测环与前馈环可以看作是一个混合电流调节器,根据系统标称条件产生命令电压,保证系统具有非常快的动态响应和较小的系统误差。模糊逻辑算法通过测量系统误差的幅值和相位角,产生修正信号来校正直接数字预测环和前馈环的增益。当参考信号和实际信号之间的差异大于给定的阈值时,因此它使系统不确定性的影响最小化。仿真结果验证了当前调节算法的有效性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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