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发明公开
CN105453406A 多电平电力变换装置 有权

多电平电力变换装置
摘要：
具备：N个(N≥1)串联连接的各相共用的直流电压源(DCC1～DCCN)；各相共用的第1飞跨电容(FC1、FC3、…、FC2N-1)，一端连接于各直流电压源(DCC1～DCCN)的负极端；各相共用的第2飞跨电容(FC2、FC4、…、FC2N)，一端连接于各直流电压源(DCC1～DCCN)的正极端；以及相模块，将第1飞跨电容(FC1、FC3、…、FC2N-1)的正极端、负极端、第2飞跨电容(FC2、FC4、…、FC2N)的正极端、负极端作为输入端子。在相模块中，针对输出级的两个开关元件(Su7、Su8)并联地连接电容器(FC1u)。由此，在多相的多电平电力变换装置中，减少所使用的元件的数量，实现装置的成本降低、小型化。
摘要（英）：

A multilevel power conversion device comprises: N DC power supplies (DCC1 to DCCN) (N >= 1) connected in series and common to each phase; first flying capacitors (FC1, FC3, ..., FC2N-1) having one end connected to the negative electrode end of each of the DC power supplies (DCC1 to DCCN) and common to each phase; a second flying capacitors (FC2, FC4, ..., FC2N) having one end connected to the positive electrode end of each of the DC power supplies (DCC1 to DCCN) and common to each phase; and a phase module using, as input terminals, the positive and negative electrode ends of the first flying capacitors (FC1, FC3, ..., FC2N-1) and the positive and negative electrode ends of the second flying capacitors (FC2, FC4, ..., FC2N). In the phase module, a capacitor (FC1u) is connected in parallel with the two switching elements (Su7, Su8) of an output stage. This reduces the number of elements used in a multiphase multilevel power conversion device, thereby reducing the cost of the device and reducing the size of the device.

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