发明名称 |
Three-level inverter, power conditioner, and power generating system |
摘要 |
A three-level inverter includes a set of series-connected capacitors connected in parallel to a direct-current power supply; two arms connected in parallel to an output of the direct-current power supply and each having an alternating-current output terminal; and a control section having a neutral voltage controller determining a three-phase voltage correction command based on a neutral voltage and voltage of the direct-current power supply, having a coordinate converter converting the three-phase voltage correction command to a voltage correction command on d-q axis, and suppressing voltage variations at the neutral point by correcting a voltage command on d-q axis based on the d-q voltage correction command. The neutral point is connected to one grounded phase of a three-phase grounded power system. The alternating-current output terminals are connected to respective non-grounded phases of the power system. A power conditioner includes the three-level inverter. A power generating system includes the power conditioner. |
申请公布号 |
US8773876(B2) |
申请公布日期 |
2014.07.08 |
申请号 |
US201113172804 |
申请日期 |
2011.06.29 |
申请人 |
Kabushiki Kaisha Yaskawa Denki |
发明人 |
Kuboyama Takashi;Yamanaka Katsutoshi |
分类号 |
H02M7/53862;H02M7/5387 |
主分类号 |
H02M7/53862 |
代理机构 |
Mori & Ward, LLP |
代理人 |
Mori & Ward, LLP |
主权项 |
1. A three-level inverter comprising:
a first capacitor connected at one terminal to a positive side of a direct power supply; a second capacitor connected at one terminal to a negative side of the direct power supply; a set of series-connected capacitors having the first capacitor and the second capacitor connected to each other at the other terminals thereof, the set of series-connected capacitors having a connecting point of the first and second capacitors as a neutral point, which is connected to one grounded phase of a three-phase grounded power system; a first arm and a second arm connected in parallel to an output of the direct-current power supply, connected also to respective non-grounded phases of the three-phase power system, and each having an alternating-current output terminal that outputs voltages of three levels, a voltage on the positive side of the direct-current power supply, a voltage on the negative side of the direct-current power supply, and a voltage at the neutral point; and a control section having a neutral voltage controller that determines a three-phase voltage correction command on the basis of the voltage at the neutral point and a voltage of the direct-current power supply, having also a coordinate converter that converts the three-phase voltage correction command to a voltage correction command on a d-q axis, and suppressing variations in voltage at the neutral point by correcting a voltage command on the d-q axis on the basis of the voltage correction command on the d-q axis. |
地址 |
Kitakyushu-Shi JP |