For variation in power, at constant voltage and power factor(0.8lag),, the load current is the only variable to control......
After integration with Grid, there is no control on terminal or output voltage. Hence power is controlled by current controller or hysteresis mode as power is prodcut of V and I. and varying I we can control the power fed to the system.
By current control method we can control both output voltage and output current of the converter.Current mode control has a very rapid input and output response
time, and has a inherent over current protection. It is commonly used for forward mode (boost) converters.[
Usage of nonlinear loads in the power system leads to harmonics in current which results in power factor problem. To improve power factor this harmonics which is introduced in current should mitigated by using current controlling converters or active filters. Hence by injecting negative harmonics which is generated by shunt active filters, we can able to compensate the harmonics in current and improve the power factor.
further We can also have voltage compensating converters called series active power filter.
Output depends on what signal we used to give as input in our controller.
Direct Torque Control (DTC) may be the most popular alternative to current control. See Wikipedia for a comparison with current control methods. The main reason why current control is so common is that over current protection requires only the limitation of the current reference to safe value.
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