求翻译：可见，随着系统负荷的不断加大，传统PI控制器的控制效果出现了较大的振荡。这是由于在低负荷工况下整定的PI参数不能适应变负荷造成的系统特性改变。由于直流母线电压在波动时仍然高于负荷最大相电压311V，因此。直流电压的波动并未对系统输出电压造成显著影响（见图7）。是什么意思？

Visible, with the system load continues to increase, the effect of traditional PI controller, there was greater control of the oscillation. This is due to the low load conditions in the PI tuning parameters can not adapt to changing system characteristics due to changes in load. As the DC bus voltag

It is evident that, with the increasing load system, traditional PI controller of a relatively large effect of controlling oscillations. This is due to the low-load tuned PI parameters of the whole to be unable to adapt to changes caused by overloading the system features change. In times of volatil

Obviously, along with the system load unceasing enlarge, the traditional PI controller control effect appeared the big vibration.This is because the installation PI parameter cannot adapt under the low load operating mode changes the system performance change which the load creates.Because direct-cu

Visible, as system load continues to increase, traditional PI controller effects control is a larger oscillations. This is because under the low load condition PI parameter tuning system that cannot adapt to the variable load caused characteristic changes. As the DC bus voltage fluctuations is still

Visible, as system load continues to increase, traditional PI controller effects control is a larger oscillations. This is because under the low load condition PI parameter tuning system that cannot adapt to the variable load caused characteristic changes. As the DC bus voltage fluctuations is still