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中文摘要：
大容量的新能源发电接入电网换流器既需可调节有功和无功功率．又需减少注入电网电流的谐波含量。双Buck电压源换流器仅用2个高频开关便可实现新能源发电接入电网。这种双Buck型换流器的滤波电感既可以置于晶闸管逆变桥的直流侧。也可置于交流侧。通过采用空间矢量分析方法。并结合晶闸管逆变桥的换相条件，对滤波电感处于不同位置的2种换流器电路的有功和无功功率处理能力进行了分析和比较，结果表明这2种电路具有不同的有功和无功处理能力．该结论为换流器的功率控制区间提供了理论基础。同时对2种电路的输出电流波形质量进行了分析，表明滤波电感置于直流侧时．由于电感电流不能突变会导致换流器输出电流波形畸变严重，而滤波电感置于交流侧时，则不会存在该问题。Saber仿真对分析结果进行了验证．
英文摘要：
The AC- DC converter for integration of high capacity renewable energy generation has to regulate the active and reactive power outputs and decrease the current harmonics injection. The dual-Buck VSC （Voltage- Source Converter） needs only two high- frequency switches for realizing renewable energy generation integration. Its filter inductors can be placed at either DC side or AC side of SCR inverter. By the space vector analysis combined with the SCR commutating conditions,the active and reactive power handling capabilities are compared between these two circuits. The results indicate that they are different. Their output current waveforms are also analyzed. The results indicate that,because the inductor current can not change suddenly,the grid side current has larger distortion when the inductor is placed at DC side than that when it is placed at AC side. All the findings are verified by Saber simulation.
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