長距離中壓線路無功優(yōu)化算法研究
馬路林
(上海電力學(xué)院 自動(dòng)化工程學(xué)院,上海 200090)
摘 要:針對已有算法在解決長距離中壓線路無功優(yōu)化問題中的不足,提出了在保證末端電壓質(zhì)量的情況下,以線路有功功率損耗最小為目標(biāo)函數(shù)的數(shù)學(xué)模型。通過改進(jìn)變尺度混沌優(yōu)化算法中尺度變換系數(shù)和“二次搜索”調(diào)節(jié)系數(shù),在保證當(dāng)前最優(yōu)解為中心的情況下,不斷縮小優(yōu)化變量的搜索范圍加強(qiáng)局部細(xì)化搜索能力,從而提高了對目標(biāo)函數(shù)的求解精度。通過實(shí)例分析可知,該算法在處理無功優(yōu)化問題時(shí)其優(yōu)化程度與線路的長度有一定關(guān)系,對于20 km以下的線路其優(yōu)化效果較為明顯,當(dāng)線路長度約為10 km時(shí)結(jié)合遺傳算法效果更佳。
關(guān)鍵詞:長距離中壓線路;變尺度;混沌理論;無功優(yōu)化
中圖分類號:TM726 文獻(xiàn)標(biāo)識碼:A 文章編號:1007-3175(2017)12-0022-04
Research on Reactive Power Optimization Algorithm for Long-Distance Medium-Voltage Line
MA Lu-lin
(College of Automation Engineering, Shanghai University of Electric Power, Shanghai 200090, China)
Abstract: Aiming at the deficiency of the existing algorithms in solving the problem of reactive power optimization of long-distance medium-voltage line, this paper proposed the mathematical model taking the minimum active power loss as the objective function under the conditions to ensure the quality of the terminal voltage. By improving the scale transformation coefficient in the scale chaos optimization algorithm and secondary search regulating coefficient and under the conditions ensuring the existing optimal solution as the centre, the hunting zone of optimization variable was constantly shrunk to reinforce the local refining search capability, so as to improve the solution precision of objective functions. The living example analysis shows that this algorithm optimizing degree is related to the length of line when the reactive power optimization problem is disposed. For the line under 20 km, the optimization is obvious, but for about 10 km line, it’s better to combine with the genetic algorithm.
Key words: long-distance medium-voltage line; variable scales; chaos theory; reactive power optimization
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