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介绍了一种新型低耐压中性线谐波治理装置的主电路结构,并对其工作原理进行了分析。该结构基于零序谐波电压互感器思路。采用单相桥式逆变电路,其输出通过变比为1:1的隔离变压器与系统相连,不会增加逆变器承受的电流。隔离变压器原边采用Y_0接法,副边采用开口三角形接法,逆变器无需承受系统基波电压,只承受零序谐波电压和不平衡电压,降低了主电路承受的电压;采用的器件少且电压等级低,节约了成本;直流侧电容由三相二极管整流器充电。并且由于补偿零序谐波,直流侧与交流侧交换的有功功率很小,因此无需对直流侧电压进行控制。研制了一套试验装置,通过实验结果分析可以看出,该电路具有耐压低、结构和控制简单、运行可靠等优点。
The main circuit structure of a new low voltage neutral line harmonic control device is introduced, and its working principle is analyzed. The structure is based on the idea of zero sequence harmonic voltage transformer. Single-phase bridge inverter circuit, the output ratio of 1: 1 through the isolation transformer connected to the system will not increase the inverter withstand current. Isolation transformer primary side using Y_0 connection, the secondary side of the open delta connection, the inverter without having to withstand the fundamental voltage of the system, only to withstand zero sequence harmonic voltage and unbalanced voltage, reducing the voltage the main circuit to withstand; the device used Low voltage level and low, cost savings; DC side capacitor by the three-phase diode rectifier charge. And due to the compensation of zero sequence harmonics, the active power exchanged between the DC side and the AC side is very small, so there is no need to control the DC side voltage. Developed a set of test equipment, the experimental results show that the circuit has the advantages of low pressure, simple structure and control, reliable operation.