| 引用本文: | 汪晋安,王鋆鑫,许建中.基于模态划分的分布式储能型MMC时域解析模型[J].电力系统保护与控制,2022,50(23):28-40. |
| WANG Jin'an,WANG Junxin,XU Jianzhong.A time-domain analytical model of MMC-DES based on modal division[J].Power System Protection and Control,2022,50(23):28-40 |
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| 摘要: |
| 分布式储能型模块化多电平换流器系统电气量谐波含量高、波动大，影响储能电池使用寿命，甚至危害系统安全稳定运行。为直观反映系统运行规律、分析影响电容电压和电池电流波动因素，建立了一种基于模态划分的分布式储能型模块化多电平换流器时域解析模型。将开关函数、平均值法和元件伏安特性相结合，耦合子模块不同工作状态和模式，列写并推导时域解析表达式。通过分析显函数的时域解析表达式，反映子模块内部电气量的波动特征和影响因素。最后，理论计算和PSCAD/EMTDC中的仿真结果对比表明，所提出的基于模态划分的分布式储能型模块化多电平换流器时域解析模型具有较高的计算精度。此外还验证了电容电压和电池电流波动大小与电容容值、储能电感值、环流幅值相位角、电池充放电功率、调制比等参数的关系。 |
| 关键词: 分布式储能型MMC 模态划分 开关函数 平均值法 时域解析模型 |
| DOI：DOI: 10.19783/j.cnki.pspc.220136 |
| 分类号: |
| 基金项目:北京市自然科学基金项目资助(3222059)；中央高校基金项目资助(2020MS003) |
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| A time-domain analytical model of MMC-DES based on modal division |
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WANG Jin'an, WANG Junxin, XU Jianzhong
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(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources
(North China Electric Power University), Beijing 102206, China)
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| Abstract: |
| The high harmonic content and fluctuation of electrical parameters of a modular multilevel converter- distributed energy storage (MMC-DES) system affect the life of the battery, and endanger the safe and stable operation of MMC-DES. To reflect the operating rules of the system directly and analyze the factors affecting the fluctuation of the capacitor voltage and battery current, a time-domain analytical model of MMC-DES based on modal division is established. The switching function, average value method and component volt-ampere characteristics are combined to write and derive the analytical expression in the time domain by coupling different working states and modes of sub-modules. By analyzing the temporal analytical expression of the explicit function, the fluctuation characteristics and influencing factors of the electrical parameters in the sub-module are reflected. Finally, comparisons between theoretical calculation and simulation obtained from PSCAD/EMTDC show that the proposed mathematical model of MMC-DES has an acceptable calculation accuracy, and verifies the relationship between the fluctuation of capacitor voltage and battery current and capacitance value, energy storage inductance value, amplitude and phase angle of circulating current, battery charge/discharge power, modulation ratio and other parameters.
This work is supported by the Beijing Municipal Natural Science Foundation (No. 32220259). |
| Key words: MMC-DES modal division switching function mean value method time domain analytical model |
