Measuring Grid Variables (Voltage, Current, PQ, Frequency, Phase Angle) of a Bus in an IEEE-9 Bus System in Simulink

Good day! As the title suggests, I am currently figuring out how to properly measure needed variables in an IEEE-9 Bus System (https://www.mathworks.com/help/sps/ug/ieee-9-bus.html).

I would like to measure the grid voltage, current, active and reactive power, frequency, and phase angle of a specific bus in the network. I would be applying this later on for voltage and frequency support of BESS in a transmission network.

At the moment, I am concerned with two things:

1) Is my measurement setup correct?

2) I tried setting up three-phase PLL with default values (https://www.mathworks.com/help/sps/ref/sinusoidalmeasurementpllthreephase.html) for frequency measurement. However, I keep getting frequency that is around -7000 Hz (it should be around 60 Hz at steady-state). I am unsure how to setup the loop filter proportional and integral gain. Is the PLL block in Simulink sufficient to use for my desired application, or should I construct my own PLL for such purpose?

(I am using fixed-step solver ode1)

I have tried understanding and solving it on my own, but the concepts still overwhelm me. I would appreciate any help to further understand the concepts. If further context or information is needed, I will gladly provide more.

Thank you!