Comparison of CCC and LCC in HVDC System

In HVDC system there's no need to consider the synchronous stability and huge transmission capacity, so the HVDC system is widely used inlarge area grid interconnectionand high-capacity long-distance transmission system. And thus its potential applications in China are very broad. This research is based on the CIGRE HVDC Benchmark Modelin PSCAD software, the test system is often used for HVDC control studies as the standard system, we can add similar program and emulator to the main circuit modelfor different DC control equipment and control strategies[1] In this paper we deeply researched the bus voltage and current level in weak AC system. The results show that CCC is more stable than LCC, while the weak AC system befalls signal-phase fault or three-phase fault. CCC is less prone to commutation failure. (C) 2011 Published by Elsevier B. V. Selection and/or peer-review under responsibility of International Materials Science Society.