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中文摘要：
为改善煤矿提升机供电网络存在的污染问题,研究了基于传统空间矢量调制的三电平配电网静止同步补偿器可获得更高的直流母线电压利用率,但是传统空间矢量在高调制度、低功率因数的情况下中点电位会出现低频振荡,严重影响器件安全和输出电压波形质量,降低了系统性能。文章针对三电平配电网静止同步补偿器中点电位低频振荡进行研究,采用基于虚拟空间矢量的三电平配电网静止同步补偿器控制策略,在保证补偿效果的同时成功的抑制了中点电位低频振荡,最后通过实验平台对控制策略进行实验验证。
英文摘要：
Aiming at the pollution of the coal mine grid for coal mine hoist,the paper studied the three-level distribution static synchronous compensator（ DSTATCOM） for higher utilization of DC bus voltage,when the traditional space vector modulation（ SVM） used as pulse width output unit. However,the neutral point potential of three-level DSTATCOM based on SVM will appear low frequency oscillation under the situation of high modulation and low power factor, seriously affecting the safety of the device and output voltage waveform quality,reduce the system performance. In this paper,the low frequency oscillation of the neutral point potential appearing in the three-level DSTATCOM was studied,and then a control strategy based on virtual space vector of the three- level DSTATCOM was proposed to eliminate low frequency oscillation of the neutral point potential and guarantee the effect of the compensation. The feasibility and correctness of the proposed method were verified by experiments.
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