Tehnički vjesnik, Vol. 24 No. 2, 2017.
Izvorni znanstveni članak
https://doi.org/10.17559/TV-20160531105901
Research on the stability of Multi-DGs system
Zhuo Chen
orcid.org/0000-0003-3091-3559
; Guizhou University, College of Electrical Engineering, Guizhou Key Laboratory of Electric Power Big Data, Guizhou Institute of Technology, 550025 Guiyang, China
Xuanqun Tang
; Guizhou University, College of Electrical Engineering, 550025 Guiyang, China
Hongjun Zhang
; Guizhou University, College of Electrical Engineering, 550025 Guiyang, China
Qingfang Zhang
; Guizhou University, College of Electrical Engineering, 550025 Guiyang, China
Yan Liu
; Guizhou University, College of Electrical Engineering, 550025 Guiyang, China
Sažetak
This paper presents an improved model of multi-DGs system for enhancing the stability. The distributed generations (DGs) in the system are equipped with the additional active power controller as the technique of enhancing the wind-thermal-bundled system stability. Firstly, the influence of multi-DGs system on the oscillation of the system is analysed. Then, the conditions for DGs producing positive damping to the power system are obtained. Secondly, taking the wind farm as the study object, the increment of the frequency of the point of common coupling (PCC) in the wind farm is feedback to the active control loops for regulating the active power of wind turbine. At the same time, the multi-DGs system holds a positive damping effect on the power system which enables the dynamic behaviour of the wind farm to be improved. Thirdly, the effect of time delay on control performance is further considered and two propositions for solving critical time-delay are put forward and proved, which are used as the constraint condition of additional active power control. Finally, the time domain simulation is implemented and the correctness of the proposed method is verified by the root locus analysis and frequency domain simulation. The results show that the additional active power control can significantly enhance the power system damping. However, the wind farm will provide negative damping and even the whole system will not maintain the power angle stability when the time-delay increases and exceeds the critical time-delay.
Ključne riječi
anti-islanding; critical time-delay; multi-DGs system; power system damping; wind farm
Hrčak ID:
179855
URI
Datum izdavanja:
14.4.2017.
Posjeta: 1.399 *