Small-Signal Stability Analysis of Power Systems Integrated with Variable Speed Wind Generators by Wenjuan Du & Haifeng Wang & Siqi Bu

Author:Wenjuan Du & Haifeng Wang & Siqi Bu
Language: eng
Format: epub
ISBN: 9783319941684
Publisher: Springer International Publishing

i

λi

gp(λi)hp(λi)

|gp(λi)hp(λi)|

1

−0.55012 + 8.4517j

0.017556 + 0.0088645j

0.019667

2

−0.47535 + 7.8201j

0.063834 + 0.02335j

0.067971

3

−0.52929 + 7.1658j

0.022357–0.11377j

0.11595

4

−0.4902 + 5.8855j

0.092222–0.22458j

0.24278

5

−0.51978 + 6.3095j

0.0057484 + 0.42818j

0.42822

5.1.2.6 Dynamic Interactions of PMSG2 with Power System

In [1], type 4 model for the GSC reactive power control outer loop of the PMSG was used instead of that shown in Fig. 5.3. Noticeable dynamic interactions were found being related to the state variables in the GSC reactive power control outer loop of the PMSG. Analysis in Sect. 5.1.1.3 has indicated that when type 4 model is used instead of that shown by Fig. 5.3, Hpq(s) could have a pair of converter oscillation modes to cause the OLMR. Reactive power control outer loop of PMSG2 in the example New England power system adopted the type 4 model. Modal computation presented in Fig. 5.10 has confirmed the analytical conclusion that there existed a pair of converter oscillation modes due to the type 4 model used by PMSG2. In this subsection, the impact of PMSG2 on the inter-area EOM of concern was examined as follow.

Firstly, PMSG1 was connected at node 22 and parameters of active power control outer loop of PMSG1 were carefully tuned to avoid causing any OLMR. The open-loop inter-area EOM of concern without dynamics of PMSG2 being included was calculated to be λi = − 0.32559 + 3.2833j.

Secondly, dynamics of PMSG2 were included and typical parameters of type 4 model given in [5] were used (Kiv = 5, Kiq = 0.02). Results of modal computation are presented in Table 5.4 as case C. From the second row of Table 5.4, it can be seen that in case C, open-loop converter oscillation mode of PMSG2, λvsc, was away from open-loop EOM of concern, λi. Impact of dynamic interactions introduced by PMSG2 was small because was small, indicating weak dynamic interactions brought about by PMSG2.Table 5.4Impact of dynamic interactions introduced by PMSG3

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