Abstract
The battery is the only power source of full electric vehicles, and the converter plays a key role in power and signal conversion; therefore, the stability and reliability of the converter determine the performance of the whole vehicle system. In order to improve the overall performance of the converter and optimize the function of the ID-NPC (improved diode neutral-point-clamped) topology with power allocation, the two-level topology is improved, and it is also a part of the ID-NPC topology. Based on the ID-NPC topology, the converter level can switch according to the proposed three-level and two-level modulation conversion strategies, which extends the fault-tolerant function of the converter. Finally, a simulation and experimental platform is built to verify the function of the improved topology and the feasibility of the proposed modulation strategy.
Highlights
Environmental and resource problems are two prominent contradictions that perplex the development of the automobile industry
According to the structural characteristics of FC-NPC, a bidirectional switching power device is used to replace the capacitive devices as a neutral-point-clamped element, similar to the “T” shape, which is called the T topology [6]
The D-NPC topology was proposed in 1980, which is more suitable for medium-volt2.1
Summary
Environmental and resource problems are two prominent contradictions that perplex the development of the automobile industry. The battery, converter, and driving motor are three important parts of an electric vehicle. The power electronic converter is a more important component, and the topology has developed from two-level to multilevel. The main structures of the multilevel converter are of the cascade type and NPC (neutral-point-clamped) type. According to the structural characteristics of FC-NPC, a bidirectional switching power device is used to replace the capacitive devices as a neutral-point-clamped element, similar to the “T” shape, which is called the T topology [6]. In order to improve the loss distribution, the A-NPC (active neutral-point-clamped) topology was proposed subsequently, but the added number of switching elements brings about increased conduction loss and switching loss [9].
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