| 引用本文: | 徐海亮,刘壮壮,王诗楠,聂飞.低惯量直流微电网并网变换器的预测电流分区补偿控制策略[J].电力自动化设备,2021,41(5): |
| XU Hailiang,LIU Zhuangzhuang,WANG Shinan,NIE Fei.Predictive current partition compensation control strategy for low inertia DC microgrid interfaced grid-connected converter[J].Electric Power Automation Equipment,2021,41(5): |
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| 摘要: |
| 低惯性直流微电网在负荷频繁投切、新能源出力波动等情况下易发生直流母线电容两侧功率不匹配的问题。通过分析直流微电网接口并网变换器输入、输出侧功率失衡机理，依据母线电压变化水平计算母线电压恢复至指令值所需能量和单位采样周期内母线电容能量变化信息，得到线性处理后的母线电容瞬时输出功率、母线电压波动等效负荷信息，最终确定电流指令补偿全值。同时考虑到电压外环的影响，提出一种电流指令快速分区补偿策略，通过调节系数实现分区的平滑过渡，并通过模型预测电流控制实现电流指令的快速跟踪，提升并网变换器的补偿响应速度，抑制母线电压波动。最后，通过仿真和实验验证了所提控制策略的有效性与可行性。 |
| 关键词: 直流微电网 并网变换器 电流指令补偿 快速分区补偿策略 母线电压波动抑制 |
| DOI：10.16081/j.epae.202105027 |
| 分类号:TM461 |
| 基金项目:国家自然科学基金资助项目(52077222,51507190) |
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| Predictive current partition compensation control strategy for low inertia DC microgrid interfaced grid-connected converter |
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XU Hailiang, LIU Zhuangzhuang, WANG Shinan, NIE Fei
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College of New Energy, China University of Petroleum(East China),Qingdao 266580, China
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| Abstract: |
| Under the condition of frequent load switching and new energy output fluctuation, low inertia DC microgrid is prone to the problem of power mismatch on both sides of DC bus capacitor. The input and output power imbalance mechanism of grid-connected converter with DC microgrid interface is analyzed. According to the bus voltage change level, the energy required for bus voltage to recover to the command value and the bus capacitor energy change information in unit sampling period are calculated. The instantaneous output power of bus capacitor and the equivalent load information of bus voltage fluctuation after linear processing are obtained, and then the full value of current command compensation is determined. Considering the influence of voltage outer loop, a fast partition compensation strategy of current command is proposed. The smooth transition of partition is realized by adjusting the coefficient, and the fast tracking of current command is realized by model predictive current control, which improves the compensation res-ponse speed of grid-connected converter and suppresses bus voltage fluctuation. Finally, the effectiveness and feasibility of the proposed control strategy are verified by simulation and experiment. |
| Key words: DC microgrid grid-connected converter current command compensation fast partition compensation strategy bus voltage fluctuation suppression |
