Vienna整流器模型预测直接功率控制研究

针对Vienna整流器非线性系统,提出了内环采用模型预测直接功率控制(MPDPC),外环采用滑模变结构控制(SMVSC)的双闭环控制策略。首先建立其数学模型,求出整流器输入功率和中点电位偏差的预测值,然后通过外环求得系统有功功率和无功功率的给定值;最后输出使系统评价函数最小的开关组合,达到对系统有功功率、无功功率和中点电位的快速准确控制,实现Vienna整流器的单位功率因数控制、直流电压稳定输出以及中点电位平衡。仿真和实验结果表明了所提方案的有效性和可行性。

Research on Model Predictive Direct Power Control of Vienna Rectifier

For the non-linear system of Vienna rectifier,a double closed-loop control strategy using model predictive direct power control(MPDPC)in the inner loop and sliding mode variable structure control(SMVSC)in the outer loop is proposed.Firstly,the Vienna rectifier is modeled to obtain the predicted values of input power and neutral point potential deviation of rectifier.Then,the given values of active power and reactive power of the system are obtained through the outer loop.Finally,switching the state that make the system cost function minimized to achieve fast and accurate control of the active and reactive power and neutral point potential of the system,and realize the unit power factor control,stable output of DC voltage and neutral point potential balance of Vienna rectifier.The effectiveness and feasibility of the proposed scheme are verified by simulations and experiments.