| 引用本文: | 晏 坤,王 辉,漆文龙,谭兴国.微电网储能系统中基于PWM加双重移相控制的双向DC／DC变换器研究[J].电力自动化设备,2015,35(4): |
| YAN Kun,WANG Hui,QI Wenlong,TAN Xingguo.Bidirectional DC／DC converter based on PWM plus dual phase-shift control for microgrid storage system[J].Electric Power Automation Equipment,2015,35(4): |
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| 摘要: |
| 针对微电网储能应用中各储能装置以及直流母线存在的电压波动对变换器工作造成的不利影响、电路环流带来的损耗问题，在原边全桥-副边升压半桥隔离型双向DC／DC拓扑的基础上，提出了PWM配合双重移相的控制方法，分析了该方法在变换器端口电压波动情况下对变换器的各种工作特性带来的改善。针对单侧H桥双重移相控制仅在端口电压匹配时才能够在整个移相范围内消除功率环流的局限性，阐述了引入PWM控制后在消除功率环流上的改进，提高了端口电压在宽变化范围下系统的工作效率。建立了PWM配合双重移相控制变换器的数学模型，并与传统移相控制变换器特性做出定量的对比。设计了所提方法应用在微电网储能系统中的控制策略，并搭建了仿真模型，对控制效果进行了对比分析，验证了所提方法的有效性。 |
| 关键词: 微电网 变换器 双向DC／DC变换器 储能 PWM 移相控制 双重移相 功率环流 |
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| 基金项目:国家自然科学基金资助项目（51177095）；新能源电力系统国家重点实验室开放课题资助项目（LAPS14013） |
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| Bidirectional DC／DC converter based on PWM plus dual phase-shift control for microgrid storage system |
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YAN Kun, WANG Hui, QI Wenlong, TAN Xingguo
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School of Electrical Engineering，Shandong University，Ji’nan 250061，China
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| Abstract: |
| In order to eliminate the harmful influence of voltage fluctuation existing in the energy storage devices and DC bus of microgrid energy storage system on the converter operation and the energy loss caused by the circulating power，a control strategy of PDPS（PWM plus Dual Phase-Shift） is proposed based on the topology of bidirectional DC／DC converter with full-bridge at the primary side and Boost half-bridge at the secondary side. The improvements of converter operating characteristics brought by the proposed strategy during the converter port voltage fluctuation are analyzed. As the single H-bridge dual phase-shift control may completely eliminate the circulating power throughout the phase-shift range only when the converter port voltage is matched，the PWM control is applied to improve the effect of circulating power elimination for enhancing the system operational efficiency in wide variation range of port voltage. The mathematical converter model with PDPS control strategy is established，and its characteristic is compared with that of the converter model with traditional phase-shift control strategy. The PDPS control strategy for microgrid energy storage system is designed，the simulation model is built，the control effect is comparatively analyzed，and its effectiveness is verified. |
| Key words: microgrid electric converters bidirectional DC／DC converter energy storage pulse width modulation phase-shift control dual phase-shift circulating power |
