基于瞬时功率观测器的单相三电平脉冲整流器直接功率控制

Direct Power Control of Single-Phase Three-Level Rectifiers Based on the Instantaneous Power Observer

为提高单相脉冲整流器直接功率控制(DPC)的动态响应速度及稳态精度,构建一种单相系统瞬时功率观测器。为实现该目标,首先,分析传统功率前馈解耦直接功率控制算法;其次,提出一种改进二阶广义积分(ISOGI)算法,用以估算网侧电压的正交分量,并根据单相整流器的数学模型,通过虚轴反馈算法对网侧电流正交向量进行估计,并结合所提ISOGI算法,构建完整的单相系统功率观测器;然后,结合脉宽调制策略,建立单相三电平脉冲整流器的功率前馈解耦控制系统,并对该控制算法的参数敏感性进行分析;最后,通过所提观测器算法与传统算法的实验结果对比验证了所提算法的正确性和有效性。

For the aim of improving the dynamic response and steady-state performance of the direct power control（DPC） for single-phase pulse rectifiers,a power observer for single-phase system is proposed in this paper.Firstly,the traditional power feed-forward decoupling control scheme is introduced.Secondly,an improved second order generated integral（ISOGI） is proposed to produce the fictitious orthogonal vector of the main voltage.Combined with the mathematic model of the adopted converter,the fictitious orthogonal vector of the line current is reconstructed by orthogonal-axis component feedback.The single-phase power observer is then constructed by combining the proposed ISOGI with the orthogonal vector estimator of line current.Thirdly,according to pulse width modulation and the proposed observer,the power feedforward decoupling control system is adopted for single-phase three-level converters.Parameter sensitivity analysis of the proposed control scheme is shown in detail.Finally,an experimental comparison between the proposed power observation scheme and the traditional method has verified the correctness and feasibility of the proposed scheme.