Page 231 - Modern Control of DC-Based Power Systems

Control Approaches for Parallel Source Converter Systems 195

Bode diagram
100
S
Magnitude (dB) 0
W e
50

–50
–100
90
Phase (deg) 45 0

–45
–90
10 –3 10 –2 10 –1 10 0 10 1 10 2 10 3 10 4
Frequency (Hz)
Figure 5.56 Sensitivity function and the corresponding weighting function W e .

Bode diagram
50 0
Magnitude (dB) –100
–50

–150
T
W_T
–200
90 0
Phase (deg) –180
–90

–270
–360
–1 0 1 2 3 4 5
10 10 10 10 10 10 10
Frequency (Hz)
Figure 5.57 Complementarity sensitivity function and the corresponding weighting
function W T .

5.7.6 Simulation Results
5.7.6.1 Cascaded System
A cascaded converter setup has been modeled in Matlab-SIMULINK
with the parameters described in Table 6.1. In the simulation, a step vari-
ation of the CPL load has been performed. The variation of the bus volt-
age during the step change of the CPL load is described in Fig. 5.60.At