基于负电阻补偿的VSC恒导纳建模方法  

Fixed-admittance Modeling Method of Voltage Source Converter Based on Compensation of Negative Resistance

作　　者：侯延琦 刘崇茹 郑乐 辛蜀骏 蔡晖 HOU Yanqi;LIU Chongru;ZHENG Le;XIN Shujun;CAI Hui(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;State Grid Economic and Technological Research Institute Co.,Ltd.,Changping District,Beijing 102209,China;Economic Research Institute of Jiangsu Electric Power Company,Nanjing 210008,Jiangsu Province,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]国网经济技术研究院有限公司,北京市昌平区102209 [3]国网江苏省电力有限公司经济技术研究院,江苏省南京市210008

出　　处：《中国电机工程学报》2022年第19期6985-6994,共10页Proceedings of the CSEE

基　　金：国家电网有限公司总部科技项目(5105-202018129A-0-0-00)。

摘　　要：电力电子器件恒导纳建模是实现电压源型换流器小步长实时仿真的关键技术,伴随离散电路(associated discrete circuit,ADC)是目前最为广泛使用的电力电子器件恒导纳模型。针对ADC模型的虚拟功率损耗问题,该文提出一种基于负电阻补偿的开关器件恒导纳建模方法,该方法基于传统ADC模型,采用后退欧拉积分算法对模型进行离散化处理,通过在导通支路串联负电阻以补偿由ADC模型储能造成的虚拟功率损耗。基于三相两电平电压源型换流器拓扑,从最小化虚拟功率损耗和维持切换系统稳定的角度出发,提出所提模型的最优参数设计方法。最后,在PSCAD/EMTDC仿真软件进行仿真实验,实验结果表明,所提模型能够显著降低稳态下换流器的虚拟功率损耗,并提高暂态工况下的仿真精度。Fixed-admittance modeling of power electronic devices is a key technology to realize small-step real-time simulation of voltage source converters. Associated discrete circuit(ADC) is a fixed-admittance model which has been most widely used. Aiming at the problem of virtual power loss of ADC, this paper proposed a fixed-admittance model based on the compensation of negative resistance. This model was based on the traditional ADC model, the backward Euler method was used to discretize this model, and the virtual power loss caused by the energy storage of ADC was compensated by connecting a negative resistance in series in the switching on branch. In addition, based on the three-phase two-level voltage source converter topology, the optimal parameter design method of the proposed model was proposed to minimize the virtual power loss and maintain the stability of the switched system. The simulation results based on PSCAD/EMTDC show that the proposed model can significantly reduce the virtual power loss in steady state and improve the simulation accuracy in transient state.

关 键 词：小步长实时仿真 恒导纳模型 伴随离散电路 负电阻补偿 

分 类 号：TM743[电气工程—电力系统及自动化]