Voltage spectrum with constant amplitude and phase when 'vType' is 'parameter',
with variable amplitude and phase when 'vType' is 'signal'.
In inertial abc-system the voltage-spectrum is given by the expression
v_spec_ABC = sqrt(2/3)*sum_n(v0[n]*cos(h[n]*(theta + alpha_tot - k*2*pi/3))) with k=0,1,2 for phase a,b,c and alpha_tot = alpha + system.alpha0 + alpha0[n] where alpha = vPhasor[2] (common phase) for signal input, else 0
Optional input:
omega angular frequency (if fType == "sig") vPhasor {modulation(v), common phase(v)} vPhasor[1] = 1 delivers the values for constant amplitudes v0 vPhasor[1] in SI or pu, depending on choice of 'units' vPhasor[2] in rad