| 计及混合储能荷电状态的光伏直流微网功率分配策略 |
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| 引用本文：杨荣1,邹晓松1,袁旭峰1,熊炜1,张腊华1,张蝶1,徐玉韬2.计及混合储能荷电状态的光伏直流微网功率分配策略[J].电网与清洁能源,2021,37(9):118~126 |
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| 基金项目:国家自然科学基金项目（52067004）；贵州省科学技术基金项目（[2019]1128） |
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| 中文摘要:针对光伏直流微电网中光伏出力和负荷投切产生的功率波动，将锂电池和超级电容器构成的混合储能系统（hybrid energy storage system，HESS）运用在直流微网中可以平抑系统功率波动和稳定直流母线电压。在考虑超级电容荷电状态（SOC）的二次功率分配的基础上，提出一种基于光伏单元，混合储能系统和负荷三者协调运行的控制模式。根据光伏电池出力情况和负载消耗功率的关系以及各储能单元间SOC的不同，将光伏直流微电网分为4种运行模式，实时调节各储能单元的出力情况，使系统各微源间的功率达到动态平衡。最后，在PSCAD/EMTDC中搭建了一个含混合储能系统的光伏直流微网仿真模型，结果表明所提控制策略既能稳定运行在各种工作模式，又能保证直流微网系统稳定可靠运行的前提下优化各微源间的出力，验证了该控制策略的有效性和准确性。 |
| 中文关键词:混合储能系统 功率分配 协调控制 直流微电网 能量管理 |
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| The Power Distribution Strategy of the Photovoltaic DC Microgrid Considering the State of Charge of Hybrid Energy Storage |
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| Abstract:In view of the power fluctuations caused by photovoltaic output and load switching in the photovoltaic DC micro-grid， the hybrid energy storage system composed of lithium batteries and super capacitor banks are used in the DC micro-grid to smooth the power fluctuations of the system and stabilize the DC bus voltage. On the basis of considering the secondary power distribution of the supercapacitor state of charge （SOC）， a control mode based on the coordinated operation of photovoltaic units， hybrid energy storage systems and loads is proposed. According to the relationship between photovoltaic cell output and load power consumption， as well as the SOC differences among energy storage units， the photovoltaic microgrid is divided into four operating modes to adjust the output of each energy storage unit in real time， so that the power of each micro-source in the system can achieve dynamic balance. Finally， a photovoltaic DC microgrid simulation model with a hybrid energy storage system is built in PSCAD/EMTDC. The simulation results suggest that the proposed control strategy can operate stably in various working modes， improve the power quality， moreover， the output of each micro-source can be optimized under the premise of stable and reliable operation of the DC micro-grid system， which verifies the effectiveness and accuracy of the control strategy. |
| keywords:hybrid energy storage system power distribution coordinated control DC microgrid energy management |
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