Impacts of Three MMC-HVDC Configurations on AC System Stability Under DC Line Faults
Impacts of Three MMC-HVDC Configurations on AC System Stability Under DC Line Faults
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DOI：
10.1109/pesgm.2015.7285663
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发表时间：
2015-07
影响因子：
6.6
通讯作者：
Geng Tang;Zheng Xu;Yuzhi Zhou
中科院分区：
文献类型：
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作者：
Geng Tang;Zheng Xu;Yuzhi Zhou
分析了三种不同的模块化多电平换流器高压直流输电（MMC-HVDC）结构的交直流系统的直流线路故障暂态稳定特性。第一种配置是基于半桥子模块的MMC（H-MMC）HVDC配置，其通过使交流断路器跳闸来清除直流线路故障。具有直流线路故障清除能力的基于钳位双子模块（CDSM）的MMC（C-MMC）高压直流输电配置构成第二种配置。具有直流线路故障清除能力的线路换相换流器（LCC）和MMC混合HVDC配置，称为LCC-二极管-MMC（LCC-D-MMC），是第三种配置。分析了三种MMC-HVDC配置下直流线路故障切除的详细过程。采用等面积判据分析直流线路故障暂态过程。此外，为了评估三种MMC-HVDC配置下的电力系统暂态稳定特性，提出了一种称为临界交流传输功率（Pac_critical）的指标。在相同的直流线路接地故障下，比较了基于三种不同MMC-HVDC配置的三个试验系统的暂态稳定特性。通过比较三个试验系统的Pac_critical，证明了LCC-D-MMC HVDC配置在直流线路故障下的优异性能。最后，将研究扩展到一个改进的新英格兰39节点系统，仿真结果与理论分析一致。
This paper analyzes the dc line fault transient stability characteristics of AC/DC power systems with three different modular multilevel converter based high voltage direct current (MMC-HVDC) configurations. The first configuration is half bridge sub-module based MMC (H-MMC) HVDC configuration, which clears dc line faults by tripping the ac circuit breakers. The clamp double sub-module (CDSM) based MMC (C-MMC) HVDC configuration with dc line fault clearance ability constitutes the second configuration. A line-commutated converter (LCC) and MMC hybrid HVDC configuration with dc line fault clearance ability, named LCC-diode-MMC (LCC-D-MMC), is the third configuration. The detailed processes of clearing dc line faults in three MMC-HVDC configurations are analyzed. The equal area criterion is utilized to analyze the dc line fault transient processes. Besides, to evaluate the power system transient stability characteristics in three MMC-HVDC configurations, an index, called critical ac transmitted power (Pac_critical), is proposed. Under the same dc line to ground fault, transient stability characteristics of three test systems based on the three different MMC-HVDC configurations are compared. Excellent performance of the LCC-D-MMC HVDC configuration under the dc line fault is demonstrated through comparison of Pac_critical in the three test systems. Finally, the study is extended to a modified New England 39-bus system, and the simulation results also correspond with the theoretical analysis.