Zubair, two answers:

(1) if grid active power is negative that means the turbine is absorbing power from the grid. Where is it going? Have you turned your turbine into a gigantic fan? Suggest you apply the law of conservation of energy to all the subsystems and see where it's being violated.

(2) I don't like the term 'reactive power'. I know it's used in many textbooks but anything reactive isn't really power in the usual sense of the word. In detail, what you get is power delivered to a load under part of the cycle and then absorbed from the load on the other part of the cycle. With a pure reactive load these are exactly equal. If the load isn't purely reactive then there will be a consistent I x V power loss, and if this is allowed for, once again the 'reactive power' over an entire cycle will be algebraically zero. So what would you mean by stating you want to make the 'reactive power' positive? Do you mean you want to make the DFIG behave like a capacitor? That won't be possible as it is primarily a huge inductor. The only way to make it capacitive is to bypass the inductance with an even larger capacitor - or maybe an active circuit which simulates a capacitor (but this will need to contain an energy store like a battery).

1. Grid Active power is coming negative

Is that a wrong sign? You must define the reference directions of the active power flow in your system. The negative value may be correct if the reference +ve direction of active power of the grid is from the grid to your local generation side. In this case, the active power produced from the local generators appears as a negative value with respect to the reference direction of the active power of the grid.

2. i wan to make DFIG's reactive power Positive , mean right now induction generator is fetching reactive power i want it to supply reactive power

DFIGs can be operated under many modes of operation, such as unity power factor, constant power factor, constant reactive power, and AVR mode. The QP control is suitable for your requirement as you can set the reference value of the reactive power of the DFIG. It is worthy to be mentioned at this point that the reactive power capability curve of the DFIG should be considered for proper study of the system. The following article handles such issues,

Article Modeling and analysis of reactive power in grid‐connected on...

Article Advanced modeling and analysis of the loading capability lim...

Article Sizing and Operational Loading of Reactive Power Compensator...

Please read

https://www.researchgate.net/publication/330248917_Repetitive_control_and_cascaded_multilevel_inverter_with_integrated_hybrid_active_filter_capability_for_wind_energy_conversion_system?_sg=fvu-PVEnZQWv1pQh5GbMQdBnJmsunS3o9zWCML6Takq0B45d6yF58int7cj8iIUgkT5fnP5jXhqD8amhbFxCUfJlMDabkwycuAhV9uEh.6Co4ro5qGLuM_Bs1bZEDTjJUJ7IwMwkodk7XG0kw5VXr-3XZ8BWWPfppcwNCdGYr-5HxuSHLaCKnCNQMf5wp9Q

You get your answer