发明授权
- 专利标题: Three-level neutral point clamping pwn inverter and neutral point voltage controller
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申请号: US10433891申请日: 2003-06-06
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公开(公告)号: US06795323B2公开(公告)日: 2004-09-21
- 发明人: Yoshiyuki Tanaka , Katsutoshi Yamanaka , Eiji Watanabe
- 申请人: Yoshiyuki Tanaka , Katsutoshi Yamanaka , Eiji Watanabe
- 优先权: JP2000-372889 20001207; JP2000-380915 20001214
- 主分类号: H02M112
- IPC分类号: H02M112
摘要:
On the basis of: a first calculated value ic which is a product of a calculated value of a time of three-phase output voltages in a state where a positive bus, a negative bus, and a neutral line are connected respectively to three-phase phase output terminals, and a predicted neutral current value in the state; and second and third calculated values icx and icy which are products of a calculated value of a time of the three-phase output voltages that can take state 1 where two of the three-phase phase output terminals are connected to the positive bus or the neutral line, and a remaining one terminal is connected to the neutral line or the negative bus, and state 2 opposite to the state, and predicted neutral current values in states 1 and 2, a time ratio of state 1 and 2 during a PWM period is determined so as to make a current flowing through the neutral line close to zero, or a potential of the neutral line of the three-phase output voltages close to a voltage which is exactly the middle between voltages of the positive and negative busses.
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