Novel Configuration and Transient Management Control Strategy for VSC-HVDC
Novel Configuration and Transient Management Control Strategy for VSC-HVDC
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DOI：
10.1109/tpwrs.2014.2305984
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发表时间：
2014-03
影响因子：
6.6
通讯作者：
A. Moawwad;M. E. El Moursi;W. Xiao;J. Kirtley
中科院分区：
文献类型：
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作者：
A. Moawwad;M. E. El Moursi;W. Xiao;J. Kirtley
提出了一种新型的基于电压源变换器（VSC）的与大型海上风力发电厂（WPP）连接的高压直流输电系统结构。提议的方案在陆上端重新配置，以实现并联和串联补偿，称为“统一vsc - hvdc”（U-VSC-HVDC）。推导了所提出的配置的数学模型，以确定所采用的串联和并联变流器的额定值。为了实现平衡和不平衡故障条件下的灵活控制策略，本文提出的暂态管理方案采用正序和负序控制器进行串联补偿。负序电压分量的确定是为了尽量减少由不对称故障引起的功率振荡，从而减少直流链路电压过调。使用PSCAD/EMTDC模拟和评估了由所建议配置的详细表示组成的测试系统。一项综合研究验证了所提出的配置和暂态管理方案的能力，以实现平稳的电力传输和卓越的电网暂态性能。此外，它最大限度地减少了响应对称和不对称电网故障的电网传播的可能性。
This paper presents a novel system configuration for voltage source converter (VSC)-based high-voltage direct current (HVDC) transmission connected to a large-scale offshore wind power plant (WPP). The proposed scheme is reconfigured at the onshore end to achieve shunt and series compensation, which is named as `Unified-VSC-HVDC' (U-VSC-HVDC). A mathematical model of the proposed configuration is derived to determine the rating of the employed series and shunt converters. To achieve a flexible control strategy for balanced and unbalanced fault conditions, the proposed transient management scheme employs positive and negative sequence controllers for the series compensation. The negative sequence voltage components are determined in such a way as to minimize power oscillations caused by asymmetrical faults, and hence to reduce DC link voltage overshoots. A test system comprised of a detailed representation of the proposed configuration is simulated and evaluated using PSCAD/EMTDC. A comprehensive study validates the capability of the proposed configuration and transient management scheme for achieving smooth power transfer and superior transient performance of the electrical grid. Also, it minimizes the possibilities of electrical network propagations in response to symmetrical and asymmetrical grid faults.