直流电流复注变换式STATCOM

发布时间：2019-06-06 05:07

【摘要】：为了解决大功率应用场合中传统电流源型变换器与交流电网连接时涉及交流侧感性储能缓冲问题,在传统并联式三相12脉波电流源型变换器直流侧设计一种基于分流电感的直流电流复注变换电路,并以此构造一种新型STATCOM系统。在分析电路结构的基础上给出开关触发时序,获得理论波形;根据系统的等效电路推导数学模型,并提出无功功率控制方法;通过仿真和实验,验证所提电路结构和无功控制方法的可行性与正确性。结果表明:新型STATCOM输入输出性能优良,无需设置入网接口缓冲交流电容器即可保证三相交流电流的连续,无需滤波即可获得高质量的电流波形;根据控制角度命令,STATCOM系统能准确调整输出电流的相位,输出相应的容性无功或感性无功,具备自由调节无功功率的能力。
[Abstract]:In order to solve the problem of inductive energy storage buffer on the AC side when the traditional current source converter is connected to the AC power grid in high power applications, A DC current complex current conversion circuit based on shunt inductor is designed on the DC side of the traditional parallel three-phase 12-pulse current source converter, and a new type of STATCOM system is constructed. On the basis of analyzing the circuit structure, the switching trigger timing is given, the theoretical waveform is obtained, the mathematical model is deduced according to the equivalent circuit of the system, and the reactive power control method is put forward. The feasibility and correctness of the proposed circuit structure and reactive power control method are verified by simulation and experiment. The results show that the input and output performance of the new STATCOM is excellent, the continuity of three-phase AC current can be guaranteed without setting up the buffer AC capacitor of the network interface, and the high quality current waveform can be obtained without filtering. According to the control angle command, the STATCOM system can accurately adjust the phase of the output current, output the corresponding capacitive reactive power or inductive reactive power, and has the ability to adjust the reactive power freely.
【作者单位】：内蒙古工业大学电力学院;
【基金】：内蒙古自治区自然科学基金重大项目(2010ZD10)~~
【分类号】：TM761.12

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