混合型模块化多电平变流器电容优化设计
发布时间：2019-01-19 14:30
【摘要】：在基于电压源型换流器的柔性高压直流输电(voltage sourced converter based high voltage direct current,VSC-HVDC)场合,由半桥和全桥子模块构成的混合型模块化多电平变流器(modular multilevel converter,MMC)因具备直流短路故障自清除能力,引起了广泛的研究。而大容量MMC子模块电容的质量、体积大,成本较高,逐渐成为其取得更广泛应用的限制因素。分析并建立了混合型MMC子模块电容电压基频纹波系数与桥臂负电压以及功率因数之间的函数关系。根据该函数,提出一种混合型MMC的参数设计方法使子模块电容最小,在提高MMC功率密度的同时降低了子模块的成本和体积。同时,对比传统的桥臂参考电压始终为正的混合型MMC,在直流电压和桥臂电流有效值相等的情况下,建立了桥臂参考电压存在负电压的混合型MMC的功率传输特性函数,并求出了函数的最优解。最后,通过±160 kV混合型MMC的对比仿真验证了所提设计方法的正确性和有效性。
[Abstract]:In the case of flexible HVDC (voltage sourced converter based high voltage direct current,VSC-HVDC based on voltage source converter, a hybrid modular multilevel converter (modular multilevel converter, is composed of half-bridge and full-bridge sub-modules. MMC) has caused extensive research because of its self-cleaning capability of DC short-circuit fault. However, the quality, volume and high cost of the capacitors of large capacity MMC submodules have gradually become the limiting factors for its wider application. The functional relationship between capacitance voltage fundamental frequency ripple coefficient and bridge arm negative voltage and power factor of hybrid MMC submodule is analyzed and established. According to this function, a hybrid MMC parameter design method is proposed to minimize the capacitance of the submodule, which can increase the power density of the MMC and reduce the cost and volume of the sub-module. At the same time, compared with the traditional hybrid MMC, whose reference voltage is always positive, the power transmission characteristic function of hybrid MMC with negative reference voltage is established under the condition that the DC voltage and the bridge arm current are equal. The optimal solution of the function is obtained. Finally, the correctness and validity of the proposed design method are verified by a 卤160 kV hybrid MMC.
【作者单位】： 中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所);
【基金】：国家自然科学基金青年科学基金项目(51507167)~~
【分类号】：TM46
[Abstract]:In the case of flexible HVDC (voltage sourced converter based high voltage direct current,VSC-HVDC based on voltage source converter, a hybrid modular multilevel converter (modular multilevel converter, is composed of half-bridge and full-bridge sub-modules. MMC) has caused extensive research because of its self-cleaning capability of DC short-circuit fault. However, the quality, volume and high cost of the capacitors of large capacity MMC submodules have gradually become the limiting factors for its wider application. The functional relationship between capacitance voltage fundamental frequency ripple coefficient and bridge arm negative voltage and power factor of hybrid MMC submodule is analyzed and established. According to this function, a hybrid MMC parameter design method is proposed to minimize the capacitance of the submodule, which can increase the power density of the MMC and reduce the cost and volume of the sub-module. At the same time, compared with the traditional hybrid MMC, whose reference voltage is always positive, the power transmission characteristic function of hybrid MMC with negative reference voltage is established under the condition that the DC voltage and the bridge arm current are equal. The optimal solution of the function is obtained. Finally, the correctness and validity of the proposed design method are verified by a 卤160 kV hybrid MMC.
【作者单位】： 中国科学院电力电子与电气驱动重点实验室(中国科学院电工研究所);
【基金】：国家自然科学基金青年科学基金项目(51507167)~~
【分类号】：TM46
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1 唐伏良,庄朝晖,熊有伦;一类新型的多电平逆变拓扑研究[J];中国电机工程学报;2000年12期
2 白路;史U，
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