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Power electronic equipment are added to Hybrid Electric Vehicle (HEV) comparing to traditional vehicles. The electromagnetic interference (EMI) produced by these equipment is extraordinarily serious, which will have influence on equipment that are attached to them. In this paper, measurement and comparisons on the conducted interference current on the main lines of vehicle-mounted high-power DC power...
One of the advantages of electric vehicle is its ability to regenerate braking energy compared with conventional motor vehicles. This is able to save the electric energy and extend the drive range of electric vehicle. However, on one hand, regeneration and usage of braking energy with a higher efficiency is still a topic to be studied. On the other hand, allocation of the general braking force between...
The development of large scale DC microgrid and high voltage direct current (HVDC) power grid requires a reliable, fast and low-loss circuit breaker. In spite of the advantages of DC gird such as low loss and no reactive power, DC grid has major disadvantages concerning control and switch actions. A new hybrid breaker with forced commutation is proposed in this paper, which is able to interrupt the...
A reliable, fast and low conduction losses DC breaker plays an significant role in the development of the DC grid. This paper presents the control strategy of the hybrid DC breaker based on series combination of full bridge Sub-modules (FBSM). The topology and operation principle of the full-bridge based hybrid DC breaker is illustrated. Compared with the topology that utilize directly IGBTs in series...
This paper presents the detailed system design of Shanghai Nanhui project — the first VSC-HVDC demonstration project in China. Two 18MW VSC converters based on Modular Multi-level topology are connected to transfer the energy generated by 11 wind turbines into Nanhui AC network. It has been verified that an improvement on voltage quality and fault ride through performance of Nanhui windfarm have been...
The modular multilevel converter (MMC) is a newly introduced switch-mode converter topology with the potential for high-voltage direct current (HVDC) transmission applications. This paper mainly focuses on the hierarchical structure, functional components and hardware configuration of the control and the protection (C&P) system for MMC VSC-HVDC. The overall structure of (C&P) system based...
Modular multilevel converter (MMC) is a new type of multilevel converter. Similar to cascaded multilevel converters, each arm consists of several submodules and each submodule includes one separate DC source in parallel. Based on the analysis of its structure and working mechanism, this paper presents two harmonic optimization techniques, known as optimized harmonic stepped-waveform (OHSW) technique...
Rough test must be done before the TSC (Thyristor switched capacitor) is put into service, to demonstrate the proper design of the valve during over-current conditions, caused by valve firing at instants with non-zero voltage between its terminals. However, modern TSC thyristor valves have a high power rating and are difficult to test directly. The core to design TSC over-current test equipment is...
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