DFIG三相四开关网侧变流器三重无差拍控制

DFIG Three-phase Four-switch Grid-side Converter Triple Deadbeat Control

针对传统双馈风机异步风力发电机(DoublyfedInductionGenerator,DFIG)网侧变流器容错性较低、并网冲击电流大、控制器参数调整复杂与动态响应慢等问题,本文研究一种三相四开关变流器,并提出一种三重无差拍控制策略。三相四开关拓扑相较于传统的六开关结构减少了开关数量,降低了开关损耗,提高设备容错性。此外,本文重点研究该拓扑的工作原理和数学模型,提出一种三重无差拍控制策略,该控制策略直流侧两电容电压控制器、电流内环控制器皆采用数字无差拍控制,实现了直流侧电容电压平衡,大大提高了系统的动态性能,且参数设计简单、易于工程实现。最后通过PSIM6.0仿真验证其正确性与有效性。

Aiming at the problems of low fault tolerance,the grid-connected inrush current is large,complex controller parameter adjustment and slow dynamic response of grid-side converters of traditional doubly fed induction generators(DFIG),a three-phase four-switch converter was studied.And a triple deadbeat control strategy is proposed.Compared with the traditional six-switch structure,the three-phase four-switch topology reduces the number of switches,reduces switching losses,and improves equipment fault tolerance.In addition,this paper focuses on the working principle and mathematical model of the topology,and proposes a triple deadbeat control strategy.In this control strategy,the two capacitor voltage controllers on the DC side and the current inner loop controller all adopt digital deadbeat control,which realizes the balance of the capacitor voltage on the DC side,greatly improves the dynamic performance of the system,and the parameter design is simple and easy to implement in engineering.Finally,the correctness and effectiveness are verified by PSIM6.0 simulation.