混合量子进化算法及其在变电站规划中的应用
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摘要
量子进化算法(Quantum-inspired Evolutionary Algorithm, QIEA)是一种以量子计算和进化算法结合的概率搜索方法,是进化算法家族中的后起之秀。与传统进化算法相比,量子进化算法在“勘探”和“开采”之间更容易取得平衡,具有全局搜索能力强、收敛速度快和种群规模小等优点,但QIEA在解决一些复杂优化问题时容易过快收敛,从而出现早熟现象得不到最优解,仍需要进一步提高搜索能力。目前国内外对量子进化算法的研究有许多改进策略,其中一个重要研究方向正是通过与其他优化算法相结合,形成新的进化搜索算法,这是基于各种优化算法都有各自的优缺点,不同优化算法的合理结合能很大程度上增强优势,弥补劣势的研究理念。本文将量子进化算法与擅长局部搜索的贪婪随机自适应搜索算法相结合,提出一种新的混合量子进化算法并将其应用到城市配电网规划优化中。
     变电站规划是城市配电网规划工作中的重要部分,变电站规划结果直接影响到电力网络投资,供电可靠性和运行经济性。本文将HQIEA应用到某地区110kV变电站规划工作中,实验结果表明该方法很好的完成了对该地区变电站选址定容的规划优化,符合该地区电力需求和未来电网建设趋势,对该地区电网规划建设有重要参考意义。
     论文主要工作及研究成果如下:
     1、对量子进化算法的基本理论进行概述,指出要解决的问题并给出量子进化算法的算法流程图和实现过程。以0/1背包问题为测试函数,将传统进化算法——遗传算法作为对比算法,在实验中对这两种算法进行测试。实验结果表明,量子进化算法有着更好的“勘探”能力,相比遗传算法在求解组合优化问题方面有着更优越性能,有着重要的研究价值,为后面内容打下基础。
     2、为提高量子进化算法的搜索性能,加强其“开采”能力,探讨了五种当前文献中有代表性的局部搜索方法。对这几种局部搜索方法进行了性能比较,概述了它们的优缺点,并用0/1背包问题对它们进行测试。将搜索性能最好的贪婪随机自适应搜索与量子进化算法结合,提出一种新混合量子进化算法。通过0/1背包问题测试验证该算法性能,实验中与当前文献中的几种方法进行了比较,得出该混合量子进化算法具有比较满意的全局搜索能力和局部搜索能力,在求解组合优化问题上有着优越的性能。
     3、将混合量子进化算法应用到变电站规划优化中,以某地区110kV变电站优化为实际案例进行试验,并以现有文献中的方法作对比分析,实验结果表明混合量子进化算法能很好的求解变电站规划优化问题,得到的优化方案合理可行,且能达到投资最省,运行经济及供电可靠的规划优化目标。从而拓展了量子进化算法及其改进算法的应用范围。
     本文工作得到教育部新世纪优秀人才支持计划项目(NCET-11-0715),中央高校基本科研业务费专项资金(SWJTY11ZT07)和国家自然科学基金(61170016)的共同资助。
The quantum-inspired evolutionary algorithm (QIEA) is a kind of probability search method, which is combined the quantum computing and evolutionary algorithm. It is a rising star in the evolutionary algorithm family. Compared with traditional evolutionary algorithm, the quantum-inspired evolutionary algorithm are more likely to achieve a balance between exploitation and exploration. It has advantages of small population size, fast convergence speed and strong global search capability. However, the QIEA is easy to rapid convergence and result in precocious phenomena when it solves some complex optimization problems. So it can't get the optimal solution. So the QIEA still need to further improve the search ability. There are many improvement strategies about the research of the QIEA. One of the QIEA's important research directions is by combining with other optimization algorithm and then it can form a new evolution search algorithm. Because all kinds of optimization algorithm have its own advantages and disadvantages, so different optimization algorithm can largely enhance advantages and make up for disadvantages by reasonable combination. This paper combines with the quantum evolutionary algorithm (QIEA) and greed random adaptive search algorithm (GRASP) and puts forward a new hybrid quantum evolutionary algorithm (HQIEA). The GRASP is good at the local search. The HQIEA has the advantage both QIEA and GRASP and abandons theirs shortage. The HQIEA is applied to the urban distribution network planning optimization.
     Substation planning is the most important part urban distribution network planning and substation planning results directly affect the investment of the power network、power distribution reliability and operational efficiency. The paper applies the HQIEA to the110kV substations planning work of an area. The experimental results show that method is very good to complete the capacity and the site of the substations in the region. The results comply with current power demand and substations construction trend of the county, it has important reference value to the current power grid planning construction planning.
     The main work and research results are as follows:
     1. The basic theory and related concepts of QIEA are introduced. The problems need to be solved are also pointed out. The algorithm process of QIEA also has been described. Genetic algorithm (GA) is one of the traditional evolutionary algorithms and as the comparative method in the knapsack problem experiments. By the comparative analysis, the experimental results show that QIEA has very good ability to exploration and strong global search ability. The QIEA has better performance in solving combinatorial optimization problems that compared with the GA. It has very important research value.
     2. To improve the search performance and enhance the exploitation ability of QIEA. This paper discusses five kinds of typical local methods in current literature. Their performance is compared with each other, the advantages and disadvantages are summarized. GRASP is elected to best performance of them, and puts forward a new hybrid quantum evolutionary algorithm (HQIEA). The HQIEA has better performance in solving knapsack problems that compared with several methods in current literature. It has the convergence speed, ideal global search ability and local search ability. The HQIEA has superior performance in solving combinatorial optimization problems.
     3. The HQIEA is applied to the substation planning optimization. The method of the current literature is as the comparative method in the110kV substations planning experiments of one area. The experimental results show that the HQIEA can well solve the substation planning optimization work. The optimization scheme is feasible and it gets the optimal object of investment in the least, running in the most economic, reliability of power supply. The results comply with current power demand and substations construction trend of the county, it has important reference value to the current power grid planning construction planning. It shows the effectiveness of the method. So as to the application range of the QIEA and its improved algorithm is expanded.
     This paper work is supported by the program for New Century Excellent Talents in university (NCET-11-0715), the project sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry and the National Natural Science Foundation of China (61170016).
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