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光储直流微网能量协调控制方法
Energy Coordinated Control Method of DC Microgrid With Photovoltaic Power Generation and Hybrid Energy Storage
投稿时间:2017-11-30  修订日期:2018-02-02
DOI:
中文关键词:  直流微电网  能量管理  光伏发电  混合储能
英文关键词:DC microgrid  energy management  photovoltaic generation  hybrid energy storage
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
谭文娟 湖南大学电气与信息工程学院 tanwenjuan1022@163.com 
陈燕东 国家电能变换与控制工程技术研究中心(湖南大学) yandong_chen@hnu.edu.cn 
杨苓 国家电能变换与控制工程技术研究中心(湖南大学) yangling_1992@163.com 
周小平 国家电能变换与控制工程技术研究中心(湖南大学) zxp2011@hnu.edu.cn 
周乐明 国家电能变换与控制工程技术研究中心(湖南大学) leming_zhou@126.com 
唐杰 多电源地区电网运行与控制湖南省重点实验室(邵阳学院) 706648502@qq.com 
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中文摘要:
      直流微网中分布式电源出力的随机波动性,不仅会引起直流母线电压大范围波动,还会影响系统的稳定运行。对此,提出了一种光储直流微网能量协调控制方法,实现了因系统功率供需不平衡引起的母线电压波动的快速平抑。该方法优先利用新能源为负荷供电,通过设定并网变换器和储能模块的工作阈值以协调管理各模块间的能量流动,避免直流母线电压小范围波动引起电力电子器件频繁动作,实现能量的最优利用。在并网状态下,直流微网通过并网变换器与大电网进行能量交换;在离网状态下,光伏模块与混合储能模块协调配合给本地负载供电。其中,考虑混合储能模块的充放电裕量,结合超级电容功率密度大和锂电池能量密度高的特点,混合储能模块让超级电容先工作来平衡系统瞬时功率,提高系统的动态响应特性,减少锂电池动作次数,延长使用寿命。锂电池工作后,可以配合超级电容调整直流母线电压,防止超级电容达到饱和的速度过快。仿真验证了所提方法的有效性。
英文摘要:
      The stochastic volatility of DC micro-grid distributed power output not only causes a large range of DC bus voltage fluctuations, but also affects the stable operation of system. Thus, the energy coordinated control method of DC microgrid with photovoltaic and hybrid energy storage (HES) is proposed in this paper, which can achieve the rapid suppression of bus voltage fluctuations caused by power imbalance. The method gives priority to the use of new energy source for load power supply. By setting the working threshold of the grid-connected converter and energy storage module to coordinate the energy flow among the modules, it avoids the frequent fluctuation of the DC bus voltage caused by the power electronic devices and realizes the optimal use of energy. In the on-grid operation, DC micro-grid exchange power with the large grid by intro-ducing grid converter module. In the off-grid operation, PV module and the hybrid energy storage module coordinate to supply for the loads. Wherein, in order to make full use of the dynamic response of super capacitors and the high energy density characteristics of lithium batteries, the mixed energy storage module makes the super capacitor work first balance instantaneous power of the system, which can improve the dy-namic response, reduce the frequency of lithium battery use and extend the service life. And then lithium batteries coordinate with the super capacitors to adjust the DC bus voltage, in order to prevent the super capacitors to reach saturation too fast. Simulation results verify the effec-tiveness of the proposed method.
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