Problem of modifying the model 'REGCV2'

[xiaoheimai95]

Dear Dr. Cui and Jinning,
I want to modify the REGCV2 in order to control the voltage. To be more specific, an external control variable u(t) is introduced into the PI controller as an additional input to regulate the reactive power Q(t), which affects the grid voltage. The code I modified in REGCV2 is as follows:

class VSGOuterPIData:
        self.ut = NumParam(default=0.0, tex_name=r'u(t)',
                           info='External control variable for Q(t)',
                           unit='p.u.',
                           power=True,
                           )
class REGCV3ModelBase(Model):
        self.vref2 = Algeb(tex_name=r'v_{ref2}',
                                   info='voltage reference after adjusted by reactive power',
                                   e_str='(u * Qref - Qe + ut) * kv + vref - vref2',
                                   v_str='u * vref')

However, it seems no response, is there any other modification I need to do in your opinion?

[jinningwang]

Maybe you can plot out the curves of involved variables, then we can know which one didn't work as expected.

[xiaoheimai95]

I only added the parameter ut and modified vref2 as mentioned. And the curve of vref2 is just the same as the one without modification, which is shown as a straight horizontal line and the value is 1.0.

[jinningwang]

Maybe also plot out Qref, Qe, kv, vref if they are variables?