发明名称 |
METHOD FOR CONTROLLING INSTANTANEOUS CURRENT AT NEUTRAL POINT IN 3 LEVEL CONVERTER/INVERTER SYSTEM |
摘要 |
PURPOSE: A method for controlling an instantaneous current at a neutral point in 3 level converter/inverter system is provided to control a voltage at a neutral point and instantaneously control a current flowing through a neutral point to zero. CONSTITUTION: A current outputted from a neutral point is calculated by multiplying an inverter output current by a vector. An offset voltage is obtained and the offset voltage is added to an initial command voltage of an inverter. A current flowing through a neutral point is transmitted to a converter controller. An output current of a converter is multiplied by the vector to calculate a current outputted by the neutral point. It is judged whether the current flowing through the neutral point is identical with a neutral point current which is calculated by multiplying an input current of the converter by a vector apply time. A power-factor is reduced to obtain a new command vector. A voltage offset value is obtained and is added to the command vector.
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申请公布号 |
KR100329342(B1) |
申请公布日期 |
2002.03.07 |
申请号 |
KR19990014031 |
申请日期 |
1999.04.20 |
申请人 |
POSCON CORPORATION |
发明人 |
CHOI, CHANG HO;HYUN, DONG SEOK;KIM, KWANG SEOB;LEE, YO HAN;SOE, JAE HYEONG |
分类号 |
H02M1/12;(IPC1-7):H02M1/12 |
主分类号 |
H02M1/12 |
代理机构 |
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主权项 |
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地址 |
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