基于数据包络分析的电压矢量控制方法

为了解决常用电压矢量控制方法需进行大量函数运算,在实际应用中较难实现,并且在实际应用中需分析电压矢量变化对电流控制的影响,需降低计算量,因此通过数据包络分析研究电压矢量控制问题。依据电压矢量控制电路图分析了电压矢量控制过程,获取电压矢量控制的过程中需遵循的三个规则。通过最近三矢量法对参考矢量进行合成,获取不同区域中各电压矢量的作用时间,采用数据包络分析法对电压矢量进行控制时,需满足电压矢量作用时间约束。数据包络分析在各采样周期内,依据电压矢量控制规则与作用时间,将不同决策单元的输入权重与输出权重当成变量,从最有利于决策单元的角度对不同决策单元的有效性进行评估,获取电压矢量评估结果,选择最优电压矢量当成下一个周期的施加矢量,实现电压矢量控制。结果表明:所提方法在波形抖动方面的控制明显更稳定;在发生突变的情况下,所提方法可快速响应;电流畸变率一直处于最低水平。可见所提方法电压矢量控制优势显著,性能强。

Research on Voltage Vector Control Method Based on Data Envelopment Analysis

In order to solve the problem that voltage vector control method needs a lot of function calculation, which is difficult to realize in practical application. In practical application, it is necessary to analyze the influence of voltage vector change on current control and reduce the calculation amount. The problem of voltage vector control is studied by data envelopment analysis. According to the circuit diagram of voltage vector control, the process of voltage vector control is analyzed, and three rules to be followed in the process of voltage vector control are obtained. The reference vectors are synthesized by the latest three-vector method to obtain the action time of the voltage vectors in different regions. When using data envelopment analysis to control the voltage vectors, the time constraints of the voltage vectors need to be satisfied. Data Envelopment Analysis (DEA) takes input and output weights of different decision-making units as variables in each sampling period according to voltage vector control rules and operation time. It evaluates the effectiveness of different decision-making units from the perspective of the most favorable decision-making units, obtains the evaluation results of voltage vector and chooses the optimal voltage vector. The voltage vector control is realized when the applied vector is applied in the next cycle. The results show that the proposed method is more stable in waveform jitter control, can respond quickly in case of sudden change, and the current distortion rate is always at the lowest level. It can be seen that the proposed voltage vector control method has remarkable advantages and strong performance.