摘要
传统的模型预测控制(model predictive control,MPC)在一个控制周期内仅可输出单一的离散电压矢量,考虑到变流器拓扑可提离散电压矢量的局限性,三相脉宽调制(pulse width modulation,PWM)整流器存在较大的稳态功率脉动。在分析三相PWM整流器离散预测模型的基础上,提出一种模型预测虚拟电压矢量(model predictive virtual voltagevectors,MPV3)控制方法,通过构建6个虚拟的电压矢量代替传统MPC中的8个离散电压矢量,旨在拓展系统的控制集覆盖范围。首先,根据最近三矢量原则确定构建虚拟电压矢量所需的离散电压矢量,接着以功率无差拍跟踪控制为指标在线求取各离散电压矢量作用时间。为了保证虚拟电压矢量的可实现性,构建相应的目标函数进行矢量作用时间的可行性判断和动态修正。最后,为验证所提MPV3方法的可行性和有效性,分别与传统MPC和占空比优化进行仿真和实验的对比分析,并进一步归类总结出各方法的优缺点及适用范围。
In the conventional model predictive control （MPC）, only one discrete voltage vector is applied during one control period. However, by the limitation of discrete voltage vectors provided by the two-level topology, there is a large tracking error. With the analysis of the three-phase PWM rectifier’s discrete predictive model, a model predictive virtual voltage vector （MPV3） control method was presented in this paper. The control set was expanded by constructing six virtual voltage vectors to replace the eight discrete voltage vectors in conventional MPC. First of all, three discrete voltage vectors were selected according to a principle of the nearest three vectors. Then the action time of each discrete voltage vector was calculated online to get a power deadbeat tracking result. To ensure the realizability of virtual voltage vectors, a feasibility judgment and dynamic correction were added to the cost function. Finally, in order to verify the feasibility and effectiveness of the proposed MPV3, a comparative analysis among the conventional MPC, the duty cycle optimization （DCO） and the proposed MPV3 was done by simulations and experiments. And a further summarization was performed to derive the advantages and disadvantages of each method and the scope of applications.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2014年第18期2926-2935,共10页
Proceedings of the CSEE
基金
江苏省普通高校研究生科研创新计划项目(CXZZ13_0930)~~
关键词
三相PWM整流器
模型预测控制
虚拟电压矢量
控制集拓展
功率脉动抑制
three-phase PWM rectifiers
model predictivecontrol （MPC）
virtual voltage vectors
control set expansion
power ripple reduction
