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Considering the problem that the active power output from storage modules cannot be reasonably distributed in a multi-storage AC microgrid, this paper proposes an improved droop control strategy based on the state of charge of the energy storage module, on the basis of stabilizing the frequency of the microgrid. Firstly, by constructing a power-exponential function model of the energy storage state of charge and droop coefficient, this control strategy enables each energy storage module to adaptively adjust the output active power according to its own state of charge, which ultimately achieves the state of charge equilibrium. Secondly, small signal analysis is used to analyze the stability of the strategy. Finally, the effectiveness of the proposed strategy is verified by Matlab/Simulink simulations and semi-physical experiments.
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针对多储能交流微电网中,储能输出有功功率不能合理分配的问题,本文在稳定电网频率的基础上,提出一种基于储能荷电状态的改进下垂控制策略。首先,通过构建储能荷电状态与下垂系数的幂指数函数模型,使各储能模块可以根据自身荷电状态自适应地调整输出的有功功率,实现荷电状态动态均衡。其次,利用小信号分析法分析该控制策略的稳定性。最后,通过Matlab/Simulink仿真和半实物实验验证了所提策略的有效性。
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改进自适应下垂控制框图, figureFileSmall=mM2ZGPhXpfAc+nMCQtRYZw==, figureFileBig=Ww8nxWVi83VUDkyUPXupaw==, tableContent=null), ArticleFig(id=1218290871250899505, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=+PNcS8tbJq++nz4MW8rzbw==, figureFileBig=0pm7OdZQ4iL7ALTy7xEpaw==, tableContent=null), ArticleFig(id=1218290871326396981, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图4, caption=
SOC变化时主导极点变化情况, figureFileSmall=+PNcS8tbJq++nz4MW8rzbw==, figureFileBig=0pm7OdZQ4iL7ALTy7xEpaw==, tableContent=null), ArticleFig(id=1218290871418671673, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=Ti2oRbMaPhqRRHVlN/aeUQ==, figureFileBig=y025gf9YvLKxc+yHgFCq/w==, tableContent=null), ArticleFig(id=1218290871485780539, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图5, caption=
n变化时主导极点变化情况, figureFileSmall=Ti2oRbMaPhqRRHVlN/aeUQ==, figureFileBig=y025gf9YvLKxc+yHgFCq/w==, tableContent=null), ArticleFig(id=1218290871565472320, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=nnCihe0revwu+KKwGX0qQg==, figureFileBig=ykS0egyIzmY8dhhU73dKRA==, tableContent=null), ArticleFig(id=1218290871649358405, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图6, caption=
p变化时主导极点变化情况, figureFileSmall=nnCihe0revwu+KKwGX0qQg==, figureFileBig=ykS0egyIzmY8dhhU73dKRA==, tableContent=null), ArticleFig(id=1218290871716467272, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=CdeizZbfY8eMh6LWliCPQA==, figureFileBig=/6ytFUhK7zQZX/aVmlbnyw==, tableContent=null), ArticleFig(id=1218290871775187532, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图7, caption=
不同控制策略下储能模块输出有功功率, figureFileSmall=CdeizZbfY8eMh6LWliCPQA==, figureFileBig=/6ytFUhK7zQZX/aVmlbnyw==, tableContent=null), ArticleFig(id=1218290871833907792, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=H0d86S+UcC7zbieKf+UCeg==, figureFileBig=vlLUga8J1YvgZEbYvwYc+g==, tableContent=null), ArticleFig(id=1218290871909405268, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图8, caption=
不同因子n和p下储能模块输出有功功率, figureFileSmall=H0d86S+UcC7zbieKf+UCeg==, figureFileBig=vlLUga8J1YvgZEbYvwYc+g==, tableContent=null), ArticleFig(id=1218290871976514133, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=jQwqXR4E75Rvr4xU/EVH6w==, figureFileBig=kTzx4FnIoowTlaL6CwKHCA==, tableContent=null), ArticleFig(id=1218290872052011608, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图9, caption=
不同因子n和p下的系统频率, figureFileSmall=jQwqXR4E75Rvr4xU/EVH6w==, figureFileBig=kTzx4FnIoowTlaL6CwKHCA==, tableContent=null), ArticleFig(id=1218290872123314779, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=gkOQXx4vOAGVayuyAEVFCA==, figureFileBig=oN1rL3VvlYcljRJDs8iWmw==, tableContent=null), ArticleFig(id=1218290872173646430, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图10, caption=
负荷突增时储能模块输出有功功率, figureFileSmall=gkOQXx4vOAGVayuyAEVFCA==, figureFileBig=oN1rL3VvlYcljRJDs8iWmw==, tableContent=null), ArticleFig(id=1218290872236560992, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=rmUXQ/DULxPd1Eu6Q/1iKg==, figureFileBig=be4u/eQxmOFz+IJjjlWidA==, tableContent=null), ArticleFig(id=1218290872307864163, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图11, caption=
负荷突增时的系统频率, figureFileSmall=rmUXQ/DULxPd1Eu6Q/1iKg==, figureFileBig=be4u/eQxmOFz+IJjjlWidA==, tableContent=null), ArticleFig(id=1218290872362390117, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=jOg+PdjionrTfosGntwjqg==, figureFileBig=7hZgkGrga9XXE4JzLW2Zcg==, tableContent=null), ArticleFig(id=1218290872433693288, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图12, caption=
负荷突增时的系统电压, figureFileSmall=jOg+PdjionrTfosGntwjqg==, figureFileBig=7hZgkGrga9XXE4JzLW2Zcg==, tableContent=null), ArticleFig(id=1218290872521773674, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=9yHdwJuG2FaB8rWG/xk0IQ==, figureFileBig=wMHD2D90zungryzx1I0liw==, tableContent=null), ArticleFig(id=1218290872593076844, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图13, caption=
储能电池2退出运行时,储能模块输出有功功率, figureFileSmall=9yHdwJuG2FaB8rWG/xk0IQ==, figureFileBig=wMHD2D90zungryzx1I0liw==, tableContent=null), ArticleFig(id=1218290872655991407, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=cyLTF0kCPT2ktKzgGx+sxw==, figureFileBig=3WAn2mcdQQBq2j/W8If4Yg==, tableContent=null), ArticleFig(id=1218290872731488882, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图14, caption=
实验环境, figureFileSmall=cyLTF0kCPT2ktKzgGx+sxw==, figureFileBig=3WAn2mcdQQBq2j/W8If4Yg==, tableContent=null), ArticleFig(id=1218290872802792053, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=VzFbbqXk/SNaquAcAOYnBw==, figureFileBig=6qH8Q46JUSAeUe2O5oysbA==, tableContent=null), ArticleFig(id=1218290872874095224, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图15, caption=
储能输出的有功功率, figureFileSmall=VzFbbqXk/SNaquAcAOYnBw==, figureFileBig=6qH8Q46JUSAeUe2O5oysbA==, tableContent=null), ArticleFig(id=1218290872941204092, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=Y1uSZdzr1svCpNTb1YCX0A==, figureFileBig=cnRZ37/EsJMjgpZw47LtEg==, tableContent=null), ArticleFig(id=1218290873025090173, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图16, caption=
逆变器输出电压, figureFileSmall=Y1uSZdzr1svCpNTb1YCX0A==, figureFileBig=cnRZ37/EsJMjgpZw47LtEg==, tableContent=null), ArticleFig(id=1218290873083810432, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=EN, label=null, caption=null, figureFileSmall=usx9h0ERPm3AYjBpDDWh/Q==, figureFileBig=fUiUDxzT9OEJc8zr6jawHQ==, tableContent=null), ArticleFig(id=1218290873159307906, tenantId=1146029695717560320, journalId=1190235702286704641, articleId=1202649049632567541, language=CN, label=图17, caption=
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| 参数 | 数值 |
| 储能电池1 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能电池2 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能1初始荷电状态水平SOC10 | 0.8 |
| 储能2初始荷电状态水平SOC20 | 0.7 |
| 初始下垂系数 | kp | 1×10-5 |
| kq | 3×10-4 |
| 下垂系数修正因子 | n | 5 |
| p | 7 |
| 公共负荷 | 有功/kW | 20 |
| 无功/kvar | 3.5 |
| 三相负荷额定线电压/V | 380 |
| 变换器载波频率/Hz | 6 000 |
| 系统频率/Hz | 50 |
| LC滤波器电感/mH | 3 |
| LC滤波器电容/μF | 1 500 |
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仿真参数
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| 参数 | 数值 |
| 储能电池1 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能电池2 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能1初始荷电状态水平SOC10 | 0.8 |
| 储能2初始荷电状态水平SOC20 | 0.7 |
| 初始下垂系数 | kp | 1×10-5 |
| kq | 3×10-4 |
| 下垂系数修正因子 | n | 5 |
| p | 7 |
| 公共负荷 | 有功/kW | 20 |
| 无功/kvar | 3.5 |
| 三相负荷额定线电压/V | 380 |
| 变换器载波频率/Hz | 6 000 |
| 系统频率/Hz | 50 |
| LC滤波器电感/mH | 3 |
| LC滤波器电容/μF | 1 500 |
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| 参数 | 数值 |
| 储能电池1 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能电池2 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能1初始荷电状态水平SOC10 | 0.85 |
| 储能2初始荷电状态水平SOC20 | 0.78 |
| 初始下垂系数 | kp | 1×10-5 |
| kq | 3×10-4 |
| 下垂系数修正因子 | n | 5 |
| p | 7 |
| 公共负荷 | 有功/kW | 10 |
| 无功/kvar | 2 |
| 三相负荷额定线电压/V | 380 |
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硬件在环实验参数
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| 参数 | 数值 |
| 储能电池1 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能电池2 | 额定电压/V | 500 |
| 容量/(A∙h) | 20 |
| 储能1初始荷电状态水平SOC10 | 0.85 |
| 储能2初始荷电状态水平SOC20 | 0.78 |
| 初始下垂系数 | kp | 1×10-5 |
| kq | 3×10-4 |
| 下垂系数修正因子 | n | 5 |
| p | 7 |
| 公共负荷 | 有功/kW | 10 |
| 无功/kvar | 2 |
| 三相负荷额定线电压/V | 380 |
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