Title :
Voltage Risk Evaluation Based on Improved Probabilistic Load Flow Considering Intermittent Wind Farm
Author :
Gao Lizhi ; Wu Junyong
Author_Institution :
Beijing Jiao Tong Univ., Beijing, China
Abstract :
The randomness and intermittence of wind power have brought a great threat to grid voltage security and new difficulties to voltage security evaluation of power system. An improved probabilistic load flow (PLF) method considering the intermittence of wind power is proposed in this paper. The simplified steady state equivalent circuit iteration of IG in wind farm is considered to compute the base load flow, avoiding the inaccuracy that wind farm is only treated as PQ or PV model. Then combined Cumulants and Gram-Charlier expansion are introduced to attain the probability of voltage violation. The theory of risk assessment is applied to the power system with wind power to make a quantitative evaluation of voltage risk. The paper also provides theory reference to the wind power security penetration. At last, the effectiveness of the proposed method is verified through IEEE 14 Benchmark Model.
Keywords :
IEEE standards; load flow; power grids; power system security; probability; risk analysis; wind power plants; Gram-Charlier expansion; IEEE 14 benchmark model; IG; PLF method; PQ model; PV model; base load flow; combined cumulants expansion; grid voltage security; improved probabilistic load flow method; intermittent wind farm; power system voltage security evaluation; quantitative evaluation; simplified steady state equivalent circuit iteration; voltage risk evaluation; voltage violation; wind power intermittence; wind power randomness; wind power security penetration; Computational modeling; Load flow; Probabilistic logic; Wind farms; Wind power generation; Wind speed;
Conference_Titel :
Power and Energy Engineering Conference (APPEEC), 2012 Asia-Pacific
Conference_Location :
Shanghai
Print_ISBN :
978-1-4577-0545-8
DOI :
10.1109/APPEEC.2012.6307130
