Natural coupling between phases in three-phase rectifiers with sinusoidal current absorption when the neutral point of the mains is isolated induces a voltage between this neutral point and the rectifier d.c. link midpoint. As it is shown in this paper, this voltage has a crucial importance on the system robustness, especially when it has to face different kinds of disturbances. However, classical current control strategies never control this voltage. In this paper, a new control philosophy is proposed. With this control strategy, two of the three freedom degrees are used to control the three phase currents and the third one allows the voltage between the mains neutral point and the d.c. link midpoint to be controlled. The obtained performance and robusness are shown much better.
| Filename: | EPE Journal - 10-3-4 - 5 - Marroyo |
| Filesize: | 1.199 MB |
