基于状态空间平均法的新型高压直流输电系统稳态建模分析

Research on Novel HVDC Transmission System with Active Filter Function

运用状态空间平均法对新型高压直流输电系统进行分析,建立了新型高压直流输电系统的模型。并在开关函数的基础上进行傅立叶变换,通过忽略高次部分,在建模过程中,用开关函数来表示阀的开关状态,其状态组合可以表示整个电压源型换流器的状态,从而可以考虑换流器的自换相过程。结果表明,新型高压直流输电技术具有良好的性能。

This paper analyses the basic principle of the novel high voltage direct current transmission system, and establishes a mathematical model. The control mode with which the novel HVDC system combines transferring power and compensating harmonic is analyzed through instanta- neous reactive power theory when the system is connected to the low voltage grid containing phase-controlled rectifier device that bring a great deal of harmonic. Finally, the fea- sibility of the method is verified by a prototype.