电压源型换流器稳态等值电路模型

发布时间：2018-09-18 08:33

【摘要】：为了计算分析含电压源型换流器(VSC)的电网,基于VSC序分量动态相量谐波分析模型和Thevenin定理,采用电流控制电压源对VSC进行等效,得出了VSC的稳态等值电路。首先,在序分量动态相量谐波分析模型下解析分析VSC稳态运行特性和交直流侧相互作用关系,列写交直流电压电流的代数方程;其次,在代数方程化简的基础上,建立了VSC交流侧基波正序稳态等值电路模型和基波负序与3次谐波正序的联立等值电路模型;最后,利用Thevenin定理,分别建立了不对称下基波负序稳态等值电路模型与3次谐波正序稳态等值电路模型。与仿真计算比较表明,通过电流控制电压源形式构建的Thevenin等效电路能够在稳态条件下等效基波正序分量、基波负序分量和3次谐波正序分量在VSC交直流侧的相互作用,可有效简化VSC的非线性特性与复杂的运行特性,为含VSC电网的稳态潮流计算和谐波潮流计算奠定基础。
[Abstract]:In order to calculate and analyze the power network with voltage source converter (VSC), based on the VSC sequence component dynamic phasor harmonic analysis model and Thevenin theorem, the current controlled voltage source is used to equalize the VSC, and the steady state equivalent circuit of VSC is obtained. Firstly, under the dynamic phasor harmonic analysis model of sequential components, the steady-state operation characteristics of VSC and the relationship between AC and DC side interactions are analytically analyzed, and the algebraic equations of AC / DC voltage and current are set up. Secondly, on the basis of the simplification of the algebraic equations, In this paper, the steady state equivalent circuit model of fundamental wave on VSC AC side and the simultaneous equivalent circuit model of fundamental negative sequence and third harmonic positive order are established. Finally, using Thevenin theorem, The fundamental negative sequence equivalent circuit model and the third harmonic positive sequence steady state equivalent circuit model are established respectively. Compared with the simulation results, the Thevenin equivalent circuit constructed in the form of current-controlled voltage source can be equivalent to the interaction of the fundamental positive sequence component, the fundamental negative sequence component and the third harmonic positive sequence component at the VSC AC / DC side under the steady state condition. It can effectively simplify the nonlinear characteristics and complex operation characteristics of VSC and lay a foundation for steady power flow calculation and harmonic power flow calculation of power networks with VSC.
【作者单位】：华南理工大学电力学院;
【基金】：国家自然科学基金(51307061) 国家“十二五”科技支撑计划(2013BAA01B02)~~
【分类号】：TM46

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