基于单周期和LCL型有源阻尼Z源逆变器并网研究
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杨旭红(1969-),女,博士,教授,主要从事智能电网控制技术、新能源发电及储能技术、火电和核电机组的仿真建模及控制技术的研究;E-mail:yangxuhong.sh@163.com

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国家自然科学基金(61203224);上海市重点科技攻关计划(14110500700);上海自然科学基金(13ZR1417800)


Grid-connected Z-source inverter based on single-cycle and dual-current loop
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    摘要:

    Z源逆变器克服了传统电压型逆变器只能降压不能升压、必须加入死区时间等缺点,在实际中得到了广泛应用。针对传统 PWM 控制和 L型、LC型滤波器的缺陷,采用单周期和 LCL型有源阻尼控制方案进行三相 Z源逆变器并网控制。单周期控制较传统 PWM 控制具有结构简单、高次谐波含量低等优点,LCL滤波器较 LC、L型滤波器滤波性能优越,但谐振峰值会降低系统稳定性,因此,采用滤波电容电流反馈有源阻尼法构成陷波器来矫正 LCL滤波器谐振峰值对系统稳定性的影响。最后,在Simulink环境下进行仿真测试,验证了所提方案的可行性和有效性。

    Abstract:

    The Z-source inverter has been widely used because it overcomes the shortcomings of the conventional voltage-type inverter that can only be stepped down and cannot be boosted, and must be added to the dead time. This paper proposes a single-cycle and LCL active damping control scheme to control the grid connection of three-phase Z-source inverter. Compared with the traditional PWM control, the singlecycle control has the advantages of simple structure, low-harmonic content and high output power quality while the LCL filter performs better than the LC and L filters, but the resonance peak reduces system stability. Therefore, the active damping method is adopted and the filter capacitor current loop and the grid-connected current loop are introduced to form a double loop control structure to suppress the adverse effect of the resonance peak on the system stability. Finally, simulations under Simulink verify the feasibility and effectiveness of the proposed scheme.

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杨旭红,孙克帅,何超杰.基于单周期和LCL型有源阻尼Z源逆变器并网研究[J].电力科学与技术学报,2021,(2):155-161. Yang Xuhong, Sun Keshuai, He Chaojie. Grid-connected Z-source inverter based on single-cycle and dual-current loop[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2021,(2):155-161.

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  • 在线发布日期: 2021-05-08