Technical gazette, Vol. 22 No. 1, 2015.
Original scientific paper
https://doi.org/10.17559/TV-20150209230644
The contribution of double-fed wind farms to transient voltage and damping of power grids
Zhenghang Hao
; XJ Electric Co., Ltd, Guizhou University, School of electrical engineering Guiyang, Guizhou Province, China, Zip code: 550003
Zhiqing Yao
; XJ Electric Co., Ltd, Xuchang City, Henan Province, China, Zip code: 461000
Shaohua Li
; XJ Electric Co., Ltd, Xuchang City, Henan Province, China, Zip code: 461000
Ailing Zhang
; XJ Electric Co., Ltd, Xuchang City, Henan Province, China, Zip code: 461000
Zhuo Chen
; Guizhou University, School of electrical engineering, Guiyang, Guizhou Province, China, Zip code: 550003
Jianyun Chai
; Tsinghua University, State Key Lab of Power Systems, Department of Electrical Engineering, Beijing, China, Zip code:100084
Abstract
To improve the ability of transient voltage support and that of damping system oscillation, this paper presents the additional transient control scheme of wind farm. The analysis indicates that under the condition of strong grids, relying on wind turbines’ own reactive power to support the transient voltage drop leads to the significant increase of rotor current; under the condition of weak grids, transient reactive power released by wind farms not only serves to suppress transient voltage drop but also makes acceptable the increase of rotor excitation current. In addition, when double-fed induction generators are mixed with conventional power plants for power transmission, we can control the increase of system damping by adding damping through wind turbines in a bid to improve the stability of the overall system. In order to implement this scheme, we produce the experimental prototype composed of IPC, fieldbus and optical equipment and conduct the closed-loop test on the real-time digital simulator (RTDS). Simulations show that under the condition of weak grids, implementing the reactive power regulation of wind farms can suppress their voltage drop to a certain extent.
Keywords
additional voltage control; doubly-fed wind farms; power system; RTDS test; simulation
Hrčak ID:
135062
URI
Publication date:
23.2.2015.
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