A Flexible Power Control Method of VSC-HVDC Link for the Enhancement of Effective Short-Circuit Ratio in a Hybrid Multi-Infeed HVDC System
A Flexible Power Control Method of VSC-HVDC Link for the Enhancement of Effective Short-Circuit Ratio in a Hybrid Multi-Infeed HVDC System
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DOI：
10.1109/tpwrs.2012.2222057
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发表时间：
2013-05
影响因子：
6.6
通讯作者：
Yan Liu;Zhe Chen
中科院分区：
文献类型：
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作者：
Yan Liu;Zhe Chen
随着电压源换流器高压直流输电（VSC-HVDC）的出现，由换流器高压直流输电（LCC HVDC）和VSC-HVDC组成的混合多馈入直流输电（HMIDC）系统成为现代电力系统中一种很有前途的输电结构。为了评估VSC-HVDC线路对HMIDC系统电压稳定性的贡献，提出了有效短路比（ESCR）的计算方法。通过计算，VSC-HVDC线路的电压支持能力可以用ESCR定量表示。在此基础上，提出了一种灵活的VSC-HVDC功率控制策略，以在电网故障时提供最大的无功支持。HMIDC系统的理论分析是基于丹麦的输电网，通过PSCAD模拟评估在不同的电网故障条件下。仿真结果验证了所提出的方法的预期性能。
With the emerging use of voltage source converter high voltage direct current (VSC-HVDC) links, the hybrid multi-infeed HVDC (HMIDC) system that includes the line commutated converter (LCC) HVDC and the VSC-HVDC links is becoming a promising power transmission structure in the modern power systems. To evaluate the contribution of the VSC-HVDC link on the voltage stability of HMIDC system, this paper proposes an effective short circuit ratio (ESCR) calculation method. Through the calculation, the voltage support capability of the VSC-HVDC link can be quantitatively represented by the ESCR. Furthermore, based on the calculation results, a flexible power control strategy for the VSC-HVDC link is developed to provide maximum reactive power support under grid faults. The theoretical analysis of the HMIDC system is based on the Danish transmission grid, evaluated through PSCAD simulations under different grid fault conditions. Simulation results are presented to validate the expected performance of the proposed method.