伪双极LCC-VSC型混合高压直流输电系统向无源网络供电的研究

发布时间：2019-05-10 08:40

【摘要】：电网换相换流器高压直流输电系统(Line Commutated Converter based High Voltage Direct Current,LCC-HVDC)在功率传输特性、线路故障时的自防护能力、过负荷能力等方面均优于交流输电,但却无法向弱交流系统和无源网络供电。电压源换流器高压直流输电系统(Voltage Source Converter based HVDC,VSC-HVDC)可实现向无源网络供电的目的,但由于电力电子技术的局限性,VSC-HVDC系统投资成本过高。结合两者的优势,提出了一种新型混合高压直流输电系统(Hybrid High Voltage Direct Current,H-HVDC)。该系统的整流侧为两个6脉动LCC接一交流网络,逆变侧为三相二电平VSC接无源网络。在此基础上,对该H-HVDC的稳态数学模型、启动特性、稳态特性与暂态特性、单极闭锁进行了研究。仿真结果表明,该H-HVDC系统能实现向无源网络供电,且具有较高的稳定性,为混合直流的进一步发展提供了理论基础。
[Abstract]:(Line Commutated Converter based High Voltage Direct Current,LCC-HVDC) is superior to AC transmission in power transmission characteristics, self-protection ability and over-load capability in the event of line failure. But it is unable to power the weak AC system and passive network. Voltage source converter (Voltage Source Converter based HVDC,VSC-HVDC) can supply power to passive network, but because of the limitation of power electronics technology, the investment cost of VSC-HVDC system is too high. Combined with their advantages, a new hybrid HVDC transmission system (Hybrid High Voltage Direct Current,H-HVDC) is proposed. The rectifier side of the system is two 6-pulse LCC connected AC networks, and the inverter side is a three-phase two-level VSC passive network. On this basis, the steady-state mathematical model, start-up characteristics, steady-state and transient characteristics, monopole latch-up of the H-HVDC are studied. The simulation results show that the H-HVDC system can supply power to the passive network and has high stability, which provides a theoretical basis for the further development of hybrid DC.
【作者单位】：四川大学电气信息学院;
【基金】：国家重点基础研究发展计划项目(973项目)(2013CB2280204)~~
【分类号】：TM721.1

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