考虑故障状态的LCC-HVDC建模方法研究
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TM743

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安徽省自然科学基金-能源互联网联合基金资助项目(2008085UD04)

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    摘要:

    直流输电系统的参数设计和故障分析依赖于系统建模与仿真,常规详细模型的仿真需要借助实时数字仿真等设备,而现有的简化模型又难以保证故障状态下的准确性,亟需提出新的建模方法以减小简化模型的暂态误差,继而降低直流输电系统的仿真难度与投入成本。为此,文中提出一种基于电网换相换流器的高压直流输电(LCC-HVDC)的常微分方程(ODE)模型,并将开关函数扩展到兼顾故障运行状态。首先,基于开关函数理论推导出LCC-HVDC的ODE模型;接着分析了自然换相点偏移和换相失败对开关函数的影响,并以此提出一种考虑故障状态的开关函数调制策略;最后结合仿真算例,研究了ODE模型在多种故障状态下的运行特性,并计算对比了仿真误差与运行效率。仿真结果表明,文中ODE模型能够准确反映换流阀的各种故障状态,且具有误差小、效率高的优点。

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Modeling method of LCC-HVDC considering fault state
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    Abstract:

    The parameter design and fault analysis of high voltage direct current (HVDC) system depend on modeling and simulation. The simulation of traditional detailed model usually needs real-time digital simulator and other equipments. However,it is difficult to ensure the accuracy of fault state in the existing simplified model. Therefore,it is necessary to propose a new modeling method to reduce the transient error of simplified model,and then reduce the simulation difficulty and design cost of HVDC system. In this paper,an ordinary differential equation (ODE) model of HVDC based on line-commuted converter (LCC-HVDC) is proposed,and the fault state of the switching function is modified. Firstly,based on the theory of switching function,the ODE model of LCC is proposed. Then,the influences of natural commutation point offset and commutation failure on the switching function are analyzed,and a switching function modulation strategy considering fault state is proposed. Finally,the simulation error and operation efficiency of ODE mode under various fault conditions are calculated with simulation examples. The simulation results show that the ODE model proposed in this paper accurately reflects the various fault states of the converter valve,with small error and high efficiency.

引用本文

王梓懿,肖华锋,高博,丁津津,孙辉.考虑故障状态的LCC-HVDC建模方法研究[J].电力工程技术,2021,40(5):78-86

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历史
  • 收稿日期:2021-04-17
  • 最后修改日期:2021-07-23
  • 录用日期:2020-12-11
  • 在线发布日期: 2021-09-30
  • 出版日期: 2021-09-28