Characteristic analysis of HVDC system with shunt capacitance commutated converter

Abstract

In this paper, a novel HVDC system is proposed for using Shunt Capacitance Commutated Converter (SCCC), and analysis of work and wiring method are given. The basic idea of the SCCC is connect the capacitors in parallel between the converter transformers and the converters at the valve winding. The parallel capacitor is used to compensate for the vast majority of the inductive reactive power which can be required during the operation time. It is proved that the SCCC not only has the advantages of reducing the failure chance in commutation of the inverter, but also can makes the capacity of the converter transformer be utilized fully. The 500 kV HVDC monopole operation system about Huizhou City, Guangdong Province Echeng as an example, conducted by simulation of the system software (MATLAB). Gotting the AC side voltage and current waveforms and the DC side voltage and current waveforms during the operation of the SCCC. It is shown that the SCCC can not only overcomes the inherent defects of the traditional HVDC converter, but also can optimizes the operation state of the converter transformer and the whole systems.