双级矩阵变换器的双空间矢量预测控制

Double Space Vector Predictive Control of Two-stage Matrix Conveter

针对电网输入电压不对称和输出负载变化等扰动,使得双级矩阵变换器(TSMC)的输入输出电能质量变差的问题,提出了双级矩阵变换器的双空间矢量参考值的预测控制算法。首先基于瞬时功率理论分析整流级输入有功功率和无功功率控制原理,分别建立两级电路的预测模型;然后提出了整流级参考输入电流矢量和逆变级参考输出电压矢量的预测算法。与开关表法的预测算法相比,本预测算法具有计算量小、开关频率固定等优点。仿真结果表明,采用所提出的控制策略,系统能有效抑制输入电压的不对称对输出性能的影响;同时,在输出负载扰动时,能保证整流级的高输入功率因数和输入电流质量,控制系统具有良好的动静态性能。该预测算法适用于工程领域中数字化控制方案的实现。

In order to make the input and output power quality better of two-stage matrix converter under the disturbance of asymmetric grid input voltage and changed output load, a predictive control algorithm of the double space vector reference value of TSMC is pro- posed. This paper analyzes the control principles of input active power and reactive power based on instantaneous power theory and es- tablishes predictive model of rectifier and inverter circuit respectively, moreover, proposes the predictive algorithm of rectifier referenced input current vector and inverter referenced output voltage vector. Compared to the predictive control strategy based on switching table, the proposed algorithm has small computation, fixed switch frequency, etc. Simulation results show that the system can restrain the im- pact of unbalanced input voltage to output performance effectively by using proposed control strategy, and it can ensure the high-level in- put power factor and input current quality of rectifier stage under the disturbance of output load, the control system obtains a good dy- namic and static performance. In addition, the prediction algorithm is suitable for realization of digital control scheme in engineering field.