| 引用本文: | 王磊,李兴源,李宽,等.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[J].电力系统保护与控制,2015,43(21):27-33. |
| WANG Lei,LI Xingyuan,LI Kuan,et al.Research of pseudo bipolar LCC-VSC hybrid HVDC system supplying passive network[J].Power System Protection and Control,2015,43(21):27-33 |
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| 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。 |
| 关键词: 混合高压直流输电系统 电网换相换流器高压直流输电系统 电压源换流器高压直流输电系统 无源网络 暂态特性 |
| DOI：10.7667/j.issn.1674-3415.2015.21.005 |
| 分类号: |
| 基金项目:国家重点基础研究发展计划项目(973项目) (2013CB2280204) |
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| Research of pseudo bipolar LCC-VSC hybrid HVDC system supplying passive network |
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WANG Lei, LI Xingyuan, LI Kuan, HU Yongyin, HUANG Rui
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School of Electrical Engineering and Information, Sichuan University, Chengdu 610065, China
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| Abstract: |
| Line commutated converter based HVDC (LCC-HVDC) is better than AC transmission in power transmission characteristic, self-defense capability in line fault, overloading capability, but it can’t supply the weak AC system and passive network. Voltage source converter based HVDC (VSC-HVDC) can supply the passive network, but the cost of its investment is high because of the limitation of power electronics technology. This paper proposes a new novel hybrid HVDC (H-HVDC) transmission system combining the advantages of both sides. The rectifier side of the H-HVDC is that two 6-pulse LCC connect a AC network, and the inverter is that three-phase two level VSC connect a passive network. On this basis, its steady-state mathematical model, start-up characteristic, steady-state and transient characteristics, monopole block are deduced. Simulation results show that this H-HVDC system can supply the passive network with high stability, which provides a theoretical foundation for further development of the future in hybrid HVDC. |
| Key words: hybrid high voltage direct current (H-HVDC) line commutated converter based HVDC (LCC-HVDC) voltage source converter based HVDC (VSC-HVDC) passive network transient characteristics |
